{"id":1331,"date":"2024-05-29T23:53:02","date_gmt":"2024-05-29T15:53:02","guid":{"rendered":"https:\/\/www.qiangzhenshuai.com\/?p=1331"},"modified":"2024-08-02T11:41:10","modified_gmt":"2024-08-02T03:41:10","slug":"shell-%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.qiangzhenshuai.com\/?p=1331","title":{"rendered":"SHELL-\u51fd\u6570"},"content":{"rendered":"

1.Shell \u51fd\u6570\u6982\u8ff0<\/h1>\n

Shell \u548c\u5176\u4ed6\u8bed\u8a00\u4e00\u6837\uff0c\u4e5f\u6709\u51fd\u6570\uff0c\u5176\u672c\u8d28\u5c31\u662f\u4e00\u6bb5\u53ef\u4ee5\u590d\u7528\u7684\u4ee3\u7801\u3002\u5c06\u6570\u636e\u8fdb\u884c\u62bd\u79bb\u5904\u7406\uff0c\u4f20\u9012\u4e0d\u540c\u7684\u503c\u8f93\u51fa\u4e0d\u540c\u7684\u7ed3\u679c\uff0c\u5728\u6307\u5b9a\u7684\u5730\u65b9\u8fdb\u884c\u8c03\u7528\u5373\u53ef\u3002<\/p>\n

2.\u4e3a\u4ec0\u4e48\u8981\u7528\u51fd\u6570<\/h1>\n

\u5982\u679c\u6211\u4eec\u8981\u91cd\u590d\u6267\u884c\u4e00\u6279\u76f8\u540c\u7684\u64cd\u4f5c\uff0c\u4e0d\u60f3\u91cd\u590d\u53bb\u5199\uff0c\u53ef\u4ee5\u5c06\u8fd9\u4e00\u7cfb\u5217\u64cd\u4f5c\u62bd\u8c61\u4e3a\u4e00\u4e2a\u51fd\u6570\uff0c\u540e\u671f\u53ef\u4ee5\u5229\u7528\u53d8\u91cf\u4f20\u503c\u8c03\u7528\u8be5\u51fd\u6570\uff0c\u4ece\u800c\u5927\u5927\u51cf\u5c11\u91cd\u590d\u6027\u52b3\u52a8\uff0c\u63d0\u5347\u6548\u7387\u51cf\u5c11\u4ee3\u7801\u91cf\uff0c\u4f7f\u5f97 Shell \u811a\u672c\u66f4\u52a0\u7684\u7075\u6d3b\u548c\u901a\u7528<\/p>\n

3.\u5b9a\u4e49\u51fd\u6570\u7684\u4e09\u79cd\u65b9\u6cd5<\/h1>\n

\u5728 Shell \u811a\u672c\u4e2d\uff0c\u6709\u4e09\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5b9a\u4e49\u51fd\u6570\uff0c\u5305\u62ec\u4f7f\u7528\u00a0function\u00a0\u5173\u952e\u5b57\u3001\u4f7f\u7528\u51fd\u6570\u540d\u548c\u5706\u62ec\u53f7\u3001\u4ee5\u53ca\u4f7f\u7528\u4e24\u4e2a\u5927\u62ec\u53f7\u3002\u4ee5\u4e0b\u662f\u8fd9\u4e09\u79cd\u65b9\u6cd5\u7684\u793a\u4f8b\uff1a<\/p>\n

\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528function\u5173\u952e\u5b57\u548c\u51fd\u6570\u540d<\/h4>\n
\n
function my_function1 {<\/div>\n
# \u51fd\u6570\u5185\u7684\u4ee3\u7801<\/div>\n
}<\/div>\n<\/div>\n

\u65b9\u6cd5\u4e8c\uff1a\u7701\u7565function\u5173\u952e\u5b57\uff0c\u76f4\u63a5\u4f7f\u7528\u51fd\u6570\u540d\u548c\u5927\u62ec\u53f7<\/h4>\n
\n
my_function2() {<\/div>\n
# \u51fd\u6570\u5185\u7684\u4ee3\u7801<\/div>\n
}<\/div>\n<\/div>\n

\u65b9\u6cd5\u4e09\uff1a\u4f7f\u7528function\u5173\u952e\u5b57\u3001\u51fd\u6570\u540d\u548c\u5927\u62ec\u53f7<\/h4>\n
\n
function my_function3() {<\/div>\n
# \u51fd\u6570\u5185\u7684\u4ee3\u7801<\/div>\n
}<\/div>\n<\/div>\n

\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0cmy_function1\u3001my_function2\u548cmy_function3\u5206\u522b\u662f\u4e09\u4e2a\u51fd\u6570\u7684\u540d\u79f0\u3002<\/p>\n

\u8fd9\u4e09\u79cd\u65b9\u6cd5\u90fd\u53ef\u4ee5\u7528\u6765\u5b9a\u4e49\u51fd\u6570\uff0c\u9009\u62e9\u54ea\u4e00\u79cd\u53d6\u51b3\u4e8e\u4e2a\u4eba\u559c\u597d\u548c\u4e60\u60ef\u3002\u901a\u5e38\u6765\u8bf4\uff0c\u7b2c\u4e8c\u79cd\u65b9\u6cd5\u662f\u6700\u5e38\u89c1\u548c\u63a8\u8350\u7684\u7528\u6cd5\uff1b\u5373\u7701\u7565function\u5173\u952e\u5b57\u800c\u76f4\u63a5\u4f7f\u7528\u51fd\u6570\u540d\u548c\u5927\u62ec\u53f7\u6765\u5b9a\u4e49\u51fd\u6570\u3002<\/p>\n

\u4e0b\u9762\u662f\u4e00\u4e2a\u5305\u542b\u4e0a\u8ff0\u4e09\u79cd\u65b9\u6cd5\u5b9a\u4e49\u51fd\u6570\u7684\u793a\u4f8bShell\u811a\u672c\uff1a<\/p>\n

\n

#!\/bin\/bash<\/p>\n

# \u65b9\u6cd5\u4e00
\nfunction my_function1 {
\necho “Method 1”
\n}<\/p>\n

# \u65b9\u6cd5\u4e8c
\nmy_function2() {
\necho “Method 2”
\n}<\/p>\n

# \u65b9\u6cd5\u4e09
\nfunction my_function3() {
\necho “Method 3”
\n}<\/p>\n

# \u8c03\u7528\u51fd\u6570
\nmy_function1
\nmy_function2
\nmy_function3<\/p>\n<\/div>\n

\u8fd0\u884c\u8be5\u811a\u672c\u5c06\u4f1a\u4f9d\u6b21\u8c03\u7528\u8fd9\u4e09\u4e2a\u65b9\u6cd5\u5b9a\u4e49\u7684\u51fd\u6570\uff0c\u5e76\u8f93\u51fa\u76f8\u5e94\u7684\u4fe1\u606f\u3002<\/p>\n

[root@shell \/server\/scripts]$ sh 3.sh
\nMethod 1
\nMethod 2
\nMethod 3
\n[root@shell \/server\/scripts]$ cat 3.sh
\n#!\/bin\/bash<\/p>\n

# \u65b9\u6cd5\u4e00
\nfunction my_function1 {
\necho “Method 1”
\n}<\/p>\n

# \u65b9\u6cd5\u4e8c
\nmy_function2() {
\necho “Method 2”
\n}<\/p>\n

# \u65b9\u6cd5\u4e09
\nfunction my_function3() {
\necho “Method 3”
\n}<\/p>\n

# \u8c03\u7528\u51fd\u6570\u76f4\u63a5\u5199\u51fd\u6570\u540d\u79f0\u5373\u53ef \u5fc5\u987b\u5148\u5b9a\u4e49\u5728\u8c03\u7528
\nmy_function1
\nmy_function2
\nmy_function3<\/p>\n

[root@shell \/server\/scripts]$ sh 3.sh
\nMethod 1
\nMethod 2
\nMethod 3<\/p>\n

\u5176\u4ed6\u811a\u672c\u4e2d\u8c03\u7528<\/h4>\n

[root@shell \/server\/scripts]$ cat 4.sh
\n#!\/bin\/sh
\n. .\/3.sh
\nmy_function1
\n[root@shell \/server\/scripts]$ cat 3.sh
\n#!\/bin\/bash<\/p>\n

# \u65b9\u6cd5\u4e00
\nfunction my_function1 {
\necho “Method 1”
\n}<\/p>\n

# \u65b9\u6cd5\u4e8c
\nmy_function2() {
\necho “Method 2”
\n}<\/p>\n

# \u65b9\u6cd5\u4e09
\nfunction my_function3() {
\necho “Method 3”
\n}<\/p>\n

# \u8c03\u7528\u51fd\u6570
\n#my_function1
\n#my_function2
\n#my_function3
\n[root@shell \/server\/scripts]$ sh 4.sh
\nMethod 1<\/p>\n

source<\/h2>\n

source\u00a0\u547d\u4ee4\uff08\u5728\u67d0\u4e9b shell \u4e2d\u4e5f\u53ef\u4ee5\u7528\u00a0.\u00a0\u8868\u793a\uff09\u4e3b\u8981\u7528\u4e8e\u5728\u5f53\u524d shell \u73af\u5883\u4e2d\u6267\u884c\u6307\u5b9a\u7684\u811a\u672c\u3002<\/p>\n

source\u547d\u4ee4\u7528\u4e8e\u5728\u5f53\u524dShell\u73af\u5883\u4e2d\u6267\u884c\u6307\u5b9a\u7684\u811a\u672c\u6587\u4ef6\uff0c\u8fd9\u6837\u53ef\u4ee5\u4f7f\u88ab\u8c03\u7528\u7684\u811a\u672c\u4e2d\u7684\u53d8\u91cf\u3001\u51fd\u6570\u3001\u4ee5\u53ca\u5176\u4ed6Shell\u547d\u4ee4\u5728\u5f53\u524dShell\u4e2d\u751f\u6548\u3002\u5f53\u4f7f\u7528source\u547d\u4ee4\u6267\u884c\u811a\u672c\u65f6\uff0c\u811a\u672c\u6587\u4ef6\u4e2d\u7684\u5185\u5bb9\u4f1a\u5728\u5f53\u524dShell\u73af\u5883\u4e2d\u76f4\u63a5\u6267\u884c\uff0c\u800c\u4e0d\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b50Shell\u3002<\/p>\n

[root@shell \/server\/scripts]$ source 3.sh
\n[root@shell \/server\/scripts]$ my_function1
\nMethod 1
\n[root@shell \/server\/scripts]$ my_function2
\nMethod 2
\n[root@shell \/server\/scripts]$ my_function3
\nMethod 3<\/p>\n

4.fun\u51fd\u6570\u5b9a\u4e49\u7684\u524d\u7f00<\/h1>\n

\u5728Shell\u811a\u672c\u7f16\u7a0b\u4e2d\uff0cfun\u5173\u952e\u5b57\u901a\u5e38\u7528\u4f5c\u51fd\u6570\u7684\u524d\u7f00\uff0c\u5c3d\u7ba1\u5b83\u672c\u8eab\u5e76\u4e0d\u662f\u4e00\u4e2a\u5f3a\u5236\u6027\u7684\u5173\u952e\u5b57\u3002fun\u53ef\u4ee5\u7528\u6765\u5b9a\u4e49\u51fd\u6570\uff0c\u4f7f\u5f97\u51fd\u6570\u7684\u5f00\u59cb\u66f4\u52a0\u9192\u76ee\u3002\u51fd\u6570\u5728Shell\u811a\u672c\u4e2d\u662f\u4e00\u7ec4\u547d\u4ee4\u7684\u96c6\u5408\uff0c\u53ef\u4ee5\u88ab\u8d4b\u4e88\u4e00\u4e2a\u540d\u79f0\uff0c\u5e76\u5728\u9700\u8981\u65f6\u901a\u8fc7\u8fd9\u4e2a\u540d\u79f0\u6765\u8c03\u7528\u3002\u51fd\u6570\u7684\u5b9a\u4e49\u5141\u8bb8\u4ee3\u7801\u7684\u590d\u7528\uff0c\u63d0\u9ad8\u4e86\u811a\u672c\u7684\u6a21\u5757\u5316\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n

fun\u5173\u952e\u5b57\u7684\u4f7f\u7528\u8bed\u6cd5<\/h4>\n

\u5728Bash Shell\u4e2d\uff0c\u5b9a\u4e49\u51fd\u6570\u7684\u8bed\u6cd5\u53ef\u4ee5\u6709\u591a\u79cd\u5f62\u5f0f\uff0c\u5176\u4e2d\u5305\u62ec\u4f7f\u7528function\u5173\u952e\u5b57\u6216\u4e0d\u4f7f\u7528\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5b9a\u4e49\u51fd\u6570\u7684\u5e38\u89c1\u8bed\u6cd5\uff1a<\/p>\n

function<\/span> funName<\/span><\/span>() { \r\n# \u51fd\u6570\u4f53<\/span> \r\n}<\/pre>\n
\u6216\u8005<\/p>\n
funName() {\r\n    # \u51fd\u6570\u4f53\r\n}<\/pre>\n
\u5728\u8fd9\u4e24\u79cd\u5f62\u5f0f\u4e2d\uff0cfunName\u662f\u51fd\u6570\u7684\u540d\u79f0\uff0c\u5706\u62ec\u53f7\u5185\u53ef\u4ee5\u5305\u542b\u51fd\u6570\u7684\u53c2\u6570\u5217\u8868\uff08\u5982\u679c\u6709\u7684\u8bdd\uff09\uff0c\u800c\u82b1\u62ec\u53f7\u5305\u56f4\u7684\u90e8\u5206\u662f\u51fd\u6570\u7684\u4e3b\u4f53\uff0c\u5373\u6267\u884c\u7279\u5b9a\u4efb\u52a1\u7684\u4e00\u7cfb\u5217\u547d\u4ee4<\/p>\n
fun\u5173\u952e\u5b57\u7684\u529f\u80fd\u548c\u4f5c\u7528<\/h4>\n
fun\u5173\u952e\u5b57\u7684\u4e3b\u8981\u529f\u80fd\u662f\u6807\u8bc6\u4e00\u4e2a\u4ee3\u7801\u5757\u4f5c\u4e3a\u51fd\u6570\u3002\u5728Shell\u811a\u672c\u4e2d\uff0c\u51fd\u6570\u53ef\u4ee5\u63a5\u53d7\u8f93\u5165\u53c2\u6570\uff0c\u6267\u884c\u4e00\u7cfb\u5217\u64cd\u4f5c\uff0c\u5e76\u53ef\u80fd\u8fd4\u56de\u4e00\u4e2a\u503c\u6216\u72b6\u6001\u7801\u3002\u901a\u8fc7\u5b9a\u4e49\u51fd\u6570\uff0c\u53ef\u4ee5\u5c06\u590d\u6742\u7684\u4efb\u52a1\u5206\u89e3\u6210\u66f4\u5c0f\u3001\u66f4\u6613\u4e8e\u7ba1\u7406\u7684\u90e8\u5206\uff0c\u4ece\u800c\u63d0\u9ad8\u811a\u672c\u7684\u6e05\u6670\u5ea6\u548c\u6548\u7387\u3002<\/p>\n
fun\u5173\u952e\u5b57\u7684\u6700\u4f73\u5b9e\u8df5\u548c\u6ce8\u610f\u4e8b\u9879<\/h4>\n
\u6e05\u6670\u547d\u540d\uff1a\u4e3a\u51fd\u6570\u9009\u62e9\u63cf\u8ff0\u6027\u5f3a\u7684\u540d\u79f0\uff0c\u4ee5\u4fbf\u4e8e\u7406\u89e3\u51fd\u6570\u7684\u529f\u80fd\u3002
\n\u5355\u4e00\u804c\u8d23\u539f\u5219\uff1a\u786e\u4fdd\u6bcf\u4e2a\u51fd\u6570\u53ea\u8d1f\u8d23\u4e00\u4e2a\u660e\u786e\u7684\u4efb\u52a1\u3002
\n\u53c2\u6570\u4f20\u9012\uff1a\u5408\u7406\u4f7f\u7528\u4f4d\u7f6e\u53c2\u6570\u548c\u547d\u540d\u53c2\u6570\uff0c\u4ee5\u4fbf\u4e8e\u51fd\u6570\u7684\u7075\u6d3b\u6027\u548c\u53ef\u8bfb\u6027\u3002
\n\u8fd4\u56de\u503c\uff1a\u4f7f\u7528return\u8bed\u53e5\u8fd4\u56de\u51fd\u6570\u7684\u72b6\u6001\u7801\uff0c\u5982\u679c\u9700\u8981\u8fd4\u56de\u6570\u636e\uff0c\u53ef\u4ee5\u901a\u8fc7echo\u547d\u4ee4\u8f93\u51fa\uff0c\u5e76\u5728\u51fd\u6570\u5916\u90e8\u6355\u83b7\u8fd9\u4e9b\u6570\u636e\u3002
\n\u5c40\u90e8\u53d8\u91cf\uff1a\u4f7f\u7528local\u5173\u952e\u5b57\u5b9a\u4e49\u5c40\u90e8\u53d8\u91cf\uff0c\u4ee5\u9632\u6b62\u53d8\u91cf\u6c61\u67d3\u5168\u5c40\u73af\u5883<\/p>\n
\u793a\u4f8b<\/h4>\n
\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684Shell\u51fd\u6570\u5b9a\u4e49\u548c\u4f7f\u7528\u793a\u4f8b\uff1a<\/p>\n
\n
\n
\n
\n
\n
\n
\u89e3\u91ca<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n
#!\/bin\/bash\r\n\r\nfunction greet() {\r\n    echo \"Hello, $1!\"\r\n}\r\n\r\ngreet \"World\"<\/pre>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cgreet\u51fd\u6570\u5b9a\u4e49\u4e86\u4e00\u4e2a\u7b80\u5355\u7684\u95ee\u5019\u8bed\uff0c\u5e76\u901a\u8fc7\u4f20\u9012\u4e00\u4e2a\u53c2\u6570\u6765\u4e2a\u6027\u5316\u95ee\u5019\u3002\u5f53\u51fd\u6570\u88ab\u8c03\u7528\u65f6\uff0c\u5b83\u4f1a\u8f93\u51fa”Hello, World!”\u3002<\/p>\n
5.\u51fd\u6570\u4f20\u53c2<\/h1>\n
\u51fd\u6570\u4f20\u53c2\u7684\u65b9\u5f0f\u6bd4\u8f83\u7b80\u5355\u76f4\u63a5<\/p>\n
#!\/bin\/bash\r\n\r\n# \u5b9a\u4e49\u51fd\u6570\r\nfunction my_function {\r\n    echo \"\u7b2c\u4e00\u4e2a\u53c2\u6570: $1\"\r\n    echo \"\u7b2c\u4e8c\u4e2a\u53c2\u6570: $2\"\r\n    echo \"\u6240\u6709\u53c2\u6570: $@\"\r\n}\r\n\r\n# \u8c03\u7528\u51fd\u6570\u5e76\u4f20\u9012\u53c2\u6570\r\nmy_function \"\u53c2\u6570 1\" \"\u53c2\u6570 2\"<\/pre>\n
\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c$1\u00a0\u8868\u793a\u7b2c\u4e00\u4e2a\u53c2\u6570\uff0c$2\u00a0\u8868\u793a\u7b2c\u4e8c\u4e2a\u53c2\u6570\uff0c$@\u00a0\u8868\u793a\u6240\u6709\u7684\u53c2\u6570\u3002<\/div>\n
\u60a8\u8fd8\u53ef\u4ee5\u6307\u5b9a\u66f4\u591a\u7684\u53c2\u6570\uff0c\u6bd4\u5982\u00a0$3\u00a0\u3001$4\u00a0\u7b49\u3002
\n\u53e6\u5916\uff0c\u5982\u679c\u60a8\u4e0d\u786e\u5b9a\u4f20\u9012\u7684\u53c2\u6570\u4e2a\u6570\uff0c\u53ef\u4ee5\u4f7f\u7528\u00a0$# \u6765\u83b7\u53d6\u53c2\u6570\u7684\u6570\u91cf\u3002<\/div>\n
[root@shell \/server\/scripts]$ cat fun.sh
\n#!\/bin\/bash
\nfun(){
\nif [ -f $1 ];then
\necho “$1 \u5b58\u5728”
\nelse
\necho “$1 \u4e0d\u5b58\u5728”
\nfi
\n}
\nfun \/etc\/passwd
\n[root@shell \/server\/scripts]$ sh fun.sh
\n\/etc\/passwd \u5b58\u5728<\/p>\n
\u8ba1\u7b97<\/h4>\n
[root@shell \/server\/scripts]$ cat fun1.sh
\n#!\/bin\/bash
\nfun(){
\nfor i in `seq 10`
\ndo
\ntotal=$[$1+$i]
\ndone
\necho \u8ba1\u7b97\u7ed3\u679c\u4e3a $total
\n}
\nfun $3
\nfun $2
\nfun $1<\/p>\n
[root@shell \/server\/scripts]$ sh fun1.sh 10 20 30
\n\u8ba1\u7b97\u7ed3\u679c\u4e3a 40
\n\u8ba1\u7b97\u7ed3\u679c\u4e3a 30
\n\u8ba1\u7b97\u7ed3\u679c\u4e3a 20<\/p>\n
6.\u51fd\u6570\u7684\u672c\u5730\u53d8\u91cf local<\/h1>\n
local\u8bed\u53e5\u5728\u7f16\u7a0b\u4e2d\u6307\u7684\u662f\u7528\u6765\u58f0\u660e\u53d8\u91cf\u4e3a\u5c40\u90e8\u4f5c\u7528\u57df\u7684\u5173\u952e\u5b57\u3002\u5c40\u90e8\u53d8\u91cf\u4ec5\u5728\u5b9a\u4e49\u5b83\u4eec\u7684\u51fd\u6570\u6216\u4ee3\u7801\u5757\u5185\u90e8\u6709\u6548\uff0c\u4e00\u65e6\u8d85\u51fa\u8fd9\u4e2a\u4f5c\u7528\u57df\uff0c\u53d8\u91cf\u5c31\u4e0d\u518d\u53ef\u7528\u3002\u4f7f\u7528local\u5173\u952e\u5b57\u53ef\u4ee5\u5e2e\u52a9\u907f\u514d\u53d8\u91cf\u540d\u7684\u51b2\u7a81\uff0c\u5e76\u4f7f\u5f97\u7a0b\u5e8f\u7684\u7ed3\u6784\u66f4\u52a0\u6e05\u6670\u548c\u6613\u4e8e\u7ef4\u62a42<\/a>4<\/a>.<\/p>\n
local\u8bed\u53e5\u7684\u4f7f\u7528\u573a\u666f<\/h4>\n
\u9650\u5236\u53d8\u91cf\u4f5c\u7528\u57df\uff1a\u5728\u51fd\u6570\u5185\u90e8\u4f7f\u7528local\u58f0\u660e\u53d8\u91cf\uff0c\u786e\u4fdd\u53d8\u91cf\u4e0d\u4f1a\u5f71\u54cd\u5230\u51fd\u6570\u5916\u90e8\u7684\u73af\u5883\u3002<\/p>\n
\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\uff1a\u901a\u8fc7\u660e\u786e\u53d8\u91cf\u7684\u4f5c\u7528\u8303\u56f4\uff0c\u53ef\u4ee5\u8ba9\u4ee3\u7801\u7684\u610f\u56fe\u66f4\u52a0\u660e\u663e\uff0c\u4fbf\u4e8e\u5176\u4ed6\u5f00\u53d1\u8005\u7406\u89e3\u548c\u7ef4\u62a4\u3002<\/p>\n
\u907f\u514d\u5168\u5c40\u53d8\u91cf\u6c61\u67d3\uff1a\u8fc7\u5ea6\u4f7f\u7528\u5168\u5c40\u53d8\u91cf\u53ef\u80fd\u5bfc\u81f4\u7a0b\u5e8f\u72b6\u6001\u96be\u4ee5\u8ffd\u8e2a\uff0c\u4f7f\u7528\u5c40\u90e8\u53d8\u91cf\u53ef\u4ee5\u51cf\u5c11\u8fd9\u79cd\u98ce\u9669\u3002<\/p>\n
local\u8bed\u53e5\u7684\u8bed\u6cd5\u548c\u5de5\u4f5c\u673a\u5236<\/h4>\n
\u5728\u4e0d\u540c\u7684\u7f16\u7a0b\u8bed\u8a00\u4e2d\uff0clocal\u5173\u952e\u5b57\u7684\u8bed\u6cd5\u548c\u4f7f\u7528\u65b9\u5f0f\u6709\u6240\u4e0d\u540c\u3002\u4f8b\u5982\uff0c\u5728Python\u4e2d\uff0c\u53d8\u91cf\u9ed8\u8ba4\u5728\u51fd\u6570\u5185\u90e8\u662f\u5c40\u90e8\u7684\uff0c\u9664\u975e\u660e\u786e\u58f0\u660e\u4e3aglobal\uff1b\u800c\u5728Lua\u548c\u67d0\u4e9bShell\u811a\u672c\u8bed\u8a00\u4e2d\uff0c\u9700\u8981\u663e\u5f0f\u4f7f\u7528local\u5173\u952e\u5b57\u6765\u58f0\u660e\u5c40\u90e8\u53d8\u91cf2<\/a>3<\/a>4<\/a>.<\/p>\n
local\u8bed\u53e5\u7684\u6700\u4f73\u5b9e\u8df5<\/h4>\n
\u5c3d\u53ef\u80fd\u4f7f\u7528\u5c40\u90e8\u53d8\u91cf\uff0c\u4ee5\u51cf\u5c11\u6f5c\u5728\u7684\u547d\u540d\u51b2\u7a81\u548c\u63d0\u9ad8\u4ee3\u7801\u7684\u5c01\u88c5\u6027\u3002<\/p>\n
\u5728\u51fd\u6570\u6216\u4ee3\u7801\u5757\u5185\u90e8\u4f7f\u7528local\u58f0\u660e\u53d8\u91cf\uff0c\u786e\u4fdd\u53d8\u91cf\u7684\u751f\u547d\u5468\u671f\u548c\u4f5c\u7528\u57df\u53d7\u5230\u9650\u5236\u3002<\/p>\n
\u907f\u514d\u5728\u5faa\u73af\u6216\u6761\u4ef6\u8bed\u53e5\u4e2d\u91cd\u65b0\u58f0\u660elocal\u53d8\u91cf\uff0c\u4ee5\u514d\u9020\u6210\u6df7\u6dc6\u3002<\/p>\n
local\u8bed\u53e5\u4e0e\u5176\u4ed6\u4f5c\u7528\u57df\u58f0\u660e\u5173\u952e\u5b57\u7684\u5173\u7cfb<\/h4>\n
local\u5173\u952e\u5b57\u4e0e\u5176\u4ed6\u4f5c\u7528\u57df\u58f0\u660e\u5173\u952e\u5b57\u5982global\u548cnonlocal\u4e00\u8d77\u4f7f\u7528\uff0c\u5206\u522b\u7528\u4e8e\u7ba1\u7406\u53d8\u91cf\u5728\u4e0d\u540c\u5c42\u7ea7\u4f5c\u7528\u57df\u4e2d\u7684\u53ef\u89c1\u6027\u548c\u751f\u547d\u5468\u671f\u3002global\u7528\u4e8e\u5728\u51fd\u6570\u5185\u90e8\u8bbf\u95ee\u5168\u5c40\u53d8\u91cf\uff0c\u800cnonlocal\u7528\u4e8e\u5728\u51fd\u6570\u5185\u90e8\u8bbf\u95ee\u95ed\u5305\u5916\u90e8\u7684\u53d8\u91cf1<\/a>4<\/a>.<\/p>\n
\u5728 Shell \u811a\u672c\u4e2d\uff0clocal\u00a0\u5173\u952e\u5b57\u7528\u4e8e\u5728\u51fd\u6570\u5185\u90e8\u5b9a\u4e49\u672c\u5730\u53d8\u91cf\u3002
\n\u672c\u5730\u53d8\u91cf\u7684\u4f5c\u7528\u8303\u56f4\u4ec5\u9650\u4e8e\u5b9a\u4e49\u5b83\u7684\u51fd\u6570\u5185\u90e8\u3002\u8fd9\u610f\u5473\u7740\u5728\u51fd\u6570\u5916\u90e8\u65e0\u6cd5\u8bbf\u95ee\u8fd9\u4e9b\u53d8\u91cf\uff0c\u5e76\u4e14\u5728\u51fd\u6570\u5185\u90e8\u5bf9\u672c\u5730\u53d8\u91cf\u7684\u4fee\u6539\u4e0d\u4f1a\u5f71\u54cd\u5230\u51fd\u6570\u5916\u90e8\u540c\u540d\u7684\u53d8\u91cf\u3002<\/p>\n
#!\/bin\/bash\r\n\r\nfunction my_function {\r\n    local local_variable=\"This is a local variable\"  # \u5b9a\u4e49\u672c\u5730\u53d8\u91cf\r\n    echo \"Local variable inside function: $local_variable\"\r\n}\r\n\r\nmy_function  # \u8c03\u7528\u51fd\u6570\r\n\r\n# \u5c1d\u8bd5\u5728\u51fd\u6570\u5916\u90e8\u8bbf\u95ee\u672c\u5730\u53d8\u91cf\u4f1a\u5931\u8d25\r\necho \"Local variable outside function: $local_variable\"# \u8fd9\u91cc\u4f1a\u63d0\u793a\u53d8\u91cf\u672a\u5b9a\u4e49<\/pre>\n
\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0clocal_variable\u00a0\u662f\u5728\u00a0my_function\u00a0\u51fd\u6570\u5185\u90e8\u4f7f\u7528\u00a0local\u00a0\u5173\u952e\u5b57\u5b9a\u4e49\u7684\u672c\u5730\u53d8\u91cf\u3002\u5728\u51fd\u6570\u5916\u90e8\u5c1d\u8bd5\u8bbf\u95ee\u5b83\u65f6\uff0c\u4f1a\u63d0\u793a\u8be5\u53d8\u91cf\u672a\u5b9a\u4e49\u3002<\/div>\n
\u4f7f\u7528\u00a0local\u00a0\u5b9a\u4e49\u672c\u5730\u53d8\u91cf\u6709\u52a9\u4e8e\u907f\u514d\u53d8\u91cf\u540d\u51b2\u7a81\uff0c\u5e76\u4f7f\u51fd\u6570\u7684\u903b\u8f91\u66f4\u52a0\u6e05\u6670\u548c\u72ec\u7acb\u3002<\/div>\n
\u518d\u6bd4\u5982\uff0c\u5982\u679c\u51fd\u6570\u5916\u90e8\u5df2\u7ecf\u6709\u4e00\u4e2a\u540c\u540d\u53d8\u91cf\uff0c\u5728\u51fd\u6570\u5185\u90e8\u4f7f\u7528\u00a0local\u00a0\u5b9a\u4e49\u7684\u540c\u540d\u53d8\u91cf\u4e0d\u4f1a\u5f71\u54cd\u5230\u5916\u90e8\u7684\u90a3\u4e2a\u53d8\u91cf\uff1a<\/p>\n
#!\/bin\/bash\r\n\r\nouter_variable=\"Outer\"\r\n\r\nfunction my_function {\r\n    local outer_variable=\"Inner\"  # \u5b9a\u4e49\u672c\u5730\u53d8\u91cf\uff0c\u4e0e\u5916\u90e8\u7684\u540c\u540d\u53d8\u91cf\u65e0\u5173\r\n    echo \"Local outer_variable inside function: $outer_variable\"\r\n}\r\n\r\nmy_function  # \u8c03\u7528\u51fd\u6570\r\necho \"Outer_variable outside function: $outer_variable\"  # \u8f93\u51fa\u4ecd\u7136\u662f \"Outer\"<\/pre>\n
\u8ba1\u7b97<\/h4>\n
[root@shell \/server\/scripts]$ cat fun2.sh
\n#!\/bin\/bash
\nfun(){
\nlocal num=10
\nfor i in `seq 10`
\ndo
\ntotal=$[$num+$i]
\ndone
\necho \u8ba1\u7b97\u7ed3\u679c\u4e3a $total
\n}
\nfun
\necho $num
\n[root@shell \/server\/scripts]$ sh fun2.sh
\n\u8ba1\u7b97\u7ed3\u679c\u4e3a 20<\/p>\n
7.\u51fd\u6570\u8fd4\u56de\u503c return<\/h1>\n
return\u8bed\u53e5\u5728\u7f16\u7a0b\u4e2d\u7528\u4e8e\u4ece\u51fd\u6570\u6216\u65b9\u6cd5\u4e2d\u8fd4\u56de\u4e00\u4e2a\u503c\uff0c\u5e76\u7ed3\u675f\u8be5\u51fd\u6570\u6216\u65b9\u6cd5\u7684\u6267\u884c\u3002\u5f53\u6267\u884c\u5230return\u8bed\u53e5\u65f6\uff0c\u7a0b\u5e8f\u63a7\u5236\u6d41\u4f1a\u8fd4\u56de\u5230\u51fd\u6570\u6216\u65b9\u6cd5\u88ab\u8c03\u7528\u7684\u4f4d\u7f6e\uff0c\u7ee7\u7eed\u6267\u884c\u540e\u7eed\u7684\u4ee3\u7801\u3002\u5982\u679c\u51fd\u6570\u6216\u65b9\u6cd5\u58f0\u660e\u4e86\u8fd4\u56de\u7c7b\u578b\uff0creturn\u8bed\u53e5\u540e\u9762\u5fc5\u987b\u8ddf\u968f\u4e00\u4e2a\u7b26\u5408\u8be5\u7c7b\u578b\u7684\u8868\u8fbe\u5f0f\u3002\u5982\u679c\u51fd\u6570\u6216\u65b9\u6cd5\u58f0\u660e\u4e3avoid\u7c7b\u578b\uff0c\u5373\u4e0d\u8fd4\u56de\u4efb\u4f55\u503c\uff0creturn\u8bed\u53e5\u53ef\u4ee5\u7701\u7565\uff0c\u6216\u8005\u4ec5\u5305\u542breturn\u5173\u952e\u5b57\u672c\u8eab1<\/a>2<\/a>3<\/a>4<\/a>.<\/p>\n
return\u8bed\u53e5\u7684\u4f7f\u7528\u573a\u666f<\/h4>\n
\u8fd4\u56de\u8ba1\u7b97\u7ed3\u679c\uff1a\u5f53\u51fd\u6570\u9700\u8981\u8ba1\u7b97\u5e76\u8fd4\u56de\u4e00\u4e2a\u503c\u65f6\uff0creturn\u8bed\u53e5\u7528\u6765\u8fd4\u56de\u8fd9\u4e2a\u8ba1\u7b97\u7ed3\u679c\u3002<\/p>\n
\u63d0\u524d\u9000\u51fa\u65b9\u6cd5\uff1a\u5728\u67d0\u4e9b\u903b\u8f91\u5224\u65ad\u540e\uff0c\u5982\u679c\u4e0d\u9700\u8981\u7ee7\u7eed\u6267\u884c\u51fd\u6570\u5269\u4f59\u7684\u4ee3\u7801\uff0c\u53ef\u4ee5\u4f7f\u7528return\u8bed\u53e5\u63d0\u524d\u9000\u51fa\u65b9\u6cd5\u3002<\/p>\n
\u9012\u5f52\u65b9\u6cd5\u4e2d\u7684\u8fd4\u56de\uff1a\u5728\u9012\u5f52\u51fd\u6570\u4e2d\uff0creturn\u8bed\u53e5\u7528\u4e8e\u8fd4\u56de\u9012\u5f52\u8c03\u7528\u7684\u7ed3\u679c\uff0c\u76f4\u81f3\u8fbe\u5230\u9012\u5f52\u7684\u57fa\u7840\u60c5\u5f62\u3002<\/p>\n
return\u8bed\u53e5\u7684\u6ce8\u610f\u4e8b\u9879<\/h4>\n
\u8fd4\u56de\u503c\u7c7b\u578b\u5339\u914d\uff1a\u786e\u4fddreturn\u8bed\u53e5\u4e2d\u7684\u8868\u8fbe\u5f0f\u4e0e\u51fd\u6570\u58f0\u660e\u7684\u8fd4\u56de\u7c7b\u578b\u76f8\u5339\u914d\u3002<\/p>\n
void\u65b9\u6cd5\u4e2d\u7684\u7528\u6cd5\uff1a\u5728\u58f0\u660e\u4e3avoid\u7684\u65b9\u6cd5\u4e2d\uff0creturn\u8bed\u53e5\u4e0d\u5e94\u6709\u4efb\u4f55\u8868\u8fbe\u5f0f\uff0c\u4ec5\u7528\u4e8e\u6307\u793a\u65b9\u6cd5\u7684\u7ed3\u675f\u3002<\/p>\n
\u591a\u4e2areturn\u8bed\u53e5\uff1a\u867d\u7136\u4e00\u4e2a\u65b9\u6cd5\u53ef\u4ee5\u5305\u542b\u591a\u4e2areturn\u8bed\u53e5\uff0c\u4f46\u8fc7\u591a\u7684return\u8bed\u53e5\u53ef\u80fd\u4f1a\u964d\u4f4e\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3002<\/p>\n
return\u8bed\u53e5\u540e\u7684\u4ee3\u7801\uff1a\u4e00\u65e6\u6267\u884c\u5230return\u8bed\u53e5\uff0c\u540e\u7eed\u7684\u4ee3\u7801\u5c06\u4e0d\u4f1a\u88ab\u6267\u884c\u3002<\/p>\n
return\u8bed\u53e5\u4e0e\u5176\u4ed6\u63a7\u5236\u8bed\u53e5\u7684\u533a\u522b<\/h4>\n
break\u8bed\u53e5\u7528\u4e8e\u7acb\u5373\u9000\u51fa\u5faa\u73af\u6216switch\u8bed\u53e5\uff0c\u800c\u4e0d\u4f1a\u8fd4\u56de\u4efb\u4f55\u503c\u3002<\/p>\n
continue\u8bed\u53e5\u7528\u4e8e\u7ed3\u675f\u5f53\u524d\u5faa\u73af\u8fed\u4ee3\uff0c\u5e76\u5f00\u59cb\u4e0b\u4e00\u6b21\u8fed\u4ee3\uff0c\u800c\u4e0d\u662f\u5b8c\u5168\u9000\u51fa\u5faa\u73af\u3002<\/p>\n
return\u8bed\u53e5\u4e0d\u4ec5\u53ef\u4ee5\u7ed3\u675f\u5f53\u524d\u51fd\u6570\u7684\u6267\u884c\uff0c\u8fd8\u53ef\u4ee5\u8fd4\u56de\u4e00\u4e2a\u503c\u7ed9\u8c03\u7528\u8005<\/p>\n
[root@shell \/server\/scripts]$ cat fun3.sh
\n#!\/bin\/bash
\nfun(){
\necho 100
\nreturn 1
\n}
\nresult=`fun`
\necho “\u5f53\u524d\u51fd\u6570\u7684\u8fd4\u56de\u503c\u662f: ” $?
\necho “\u5f53\u524d\u51fd\u6570\u7684\u76f4\u63a5\u7ed3\u679c\u662f: ” $result
\n[root@shell \/server\/scripts]$ sh fun3.sh
\n\u5f53\u524d\u51fd\u6570\u7684\u8fd4\u56de\u503c\u662f: 1
\n\u5f53\u524d\u51fd\u6570\u7684\u76f4\u63a5\u7ed3\u679c\u662f: 100<\/p>\n
\u5728\u8fd9\u4e2a\u811a\u672c\u4e2d\uff0c\u5b9a\u4e49\u4e86\u4e00\u4e2a\u540d\u4e3afun\u7684\u51fd\u6570\uff0c\u51fd\u6570\u5185\u90e8\u6253\u5370\u51fa\u4e86\u6570\u5b57100\uff0c\u5e76\u901a\u8fc7return\u8bed\u53e5\u8fd4\u56de\u4e86\u503c1\u3002\u5728\u8c03\u7528\u51fd\u6570fun\u65f6\uff0c\u4f7f\u7528\u53cd\u5f15\u53f7“\u6765\u83b7\u53d6\u51fd\u6570\u7684\u8f93\u51fa\u503c\uff0c\u7ed3\u679c\u4fdd\u5b58\u5728result\u53d8\u91cf\u4e2d\u3002\u7136\u540e\u5206\u522b\u8f93\u51fa\u51fd\u6570\u7684\u8fd4\u56de\u503c\u548c\u51fd\u6570\u7684\u76f4\u63a5\u7ed3\u679c\u3002<\/p>\n
\u5728shell\u811a\u672c\u4e2d\uff0c\u51fd\u6570\u7684\u8fd4\u56de\u503c\u901a\u8fc7return\u8bed\u53e5\u6765\u5b9a\u4e49\uff0c\u51fd\u6570\u7684\u76f4\u63a5\u8f93\u51fa\u662f\u901a\u8fc7echo\u7b49\u547d\u4ee4\u8f93\u51fa\u7684\u5185\u5bb9\u3002\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u8fd4\u56de\u503c\u662f1\uff0c\u76f4\u63a5\u7ed3\u679c\u662f100\u3002<\/p>\n
\u4f7f\u7528\u8fd4\u56de\u503c\u6765\u5224\u65ad\u6587\u4ef6\u662f\u5426\u5b58\u5728<\/h4>\n
[root@shell \/server\/scripts]$ cat fun4.sh\r\n#!\/bin\/bash\r\nfun(){ \r\n      if [ -f $1 ];then\r\n         return 50\r\n      else\r\n         return 100\r\n      fi \r\n}\r\nfun $1\r\n\r\n[root@shell \/server\/scripts]$ sh fun4.sh \/etc\/passwd\r\n[root@shell \/server\/scripts]$ echo $?\r\n50\r\n\r\n[root@shell \/server\/scripts]$ sh fun4.sh \/etc\/passwdq\r\n[root@shell \/server\/scripts]$ echo $?\r\n100<\/pre>\n
fun()\uff1a\u5b9a\u4e49\u4e86\u4e00\u4e2a\u540d\u79f0\u4e3afun\u7684\u51fd\u6570\u3002
\nif [ -f “$1” ]; then\uff1a\u4f7f\u7528if\u8bed\u53e5\u548c[ -f “$ 1” ]\u6d4b\u8bd5\u6761\u4ef6\u6765\u68c0\u67e5\u53c2\u6570$1\u6307\u5b9a\u7684\u6587\u4ef6\u662f\u5426\u662f\u4e00\u4e2a\u5b58\u5728\u7684\u666e\u901a\u6587\u4ef6\u3002
\nreturn 50\uff1a\u5982\u679c\u6587\u4ef6\u5b58\u5728\uff0creturn\u8bed\u53e5\u5c0650\u4f5c\u4e3a\u51fd\u6570\u7684\u9000\u51fa\u72b6\u6001\u7801\u8fd4\u56de\u3002
\nreturn 100\uff1a\u5982\u679c\u6587\u4ef6\u4e0d\u5b58\u5728\uff0creturn\u8bed\u53e5\u5c06100\u4f5c\u4e3a\u51fd\u6570\u7684\u9000\u51fa\u72b6\u6001\u7801\u8fd4\u56de\u3002
\nfun “$1″\uff1a\u5728\u811a\u672c\u7684\u6700\u540e\uff0c\u8c03\u7528fun\u51fd\u6570\uff0c\u5e76\u5c06\u547d\u4ee4\u884c\u53c2\u6570$ 1\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u51fd<\/p>\n
[root@shell \/server\/scripts]$ cat fun5.sh \r\n#!\/bin\/bash\r\nfun(){ \r\n     if [ -f $1 ];then\r\n         return 50\r\n     else\r\n         return 100\r\n       fi \r\n}\r\nfun $1\r\n[ $? -eq 50 ] && echo \"$1 \u5b58\u5728\" || echo \"$1 \u4e0d\u5b58\u5728\"\r\n\r\n[root@shell \/server\/scripts]$ sh fun5.sh \/etc\/passwd\r\n\/etc\/passwd \u5b58\u5728\r\n[root@shell \/server\/scripts]$ sh fun5.sh \/etc\/passwdd\r\n\/etc\/passwdd \u4e0d\u5b58\u5728<\/pre>\n
\u5728\u51fd\u6570\u8c03\u7528\u00a0fun $1\u00a0\u4e4b\u540e\uff0c\u4f7f\u7528\u00a0$ ?\u00a0\u6765\u6355\u83b7\u51fd\u6570\u7684\u9000\u51fa\u72b6\u6001\u7801\u3002$?\u00a0\u662f\u4e00\u4e2a\u7279\u6b8a\u53d8\u91cf\uff0c\u7528\u4e8e\u5b58\u50a8\u4e0a\u4e00\u4e2a\u547d\u4ee4\u7684\u9000\u51fa\u72b6\u6001\u3002\u63a5\u4e0b\u6765\u7684\u00a0[$ ? -eq 50 ] && echo “$1 \u5b58\u5728” || echo “$ 1 \u4e0d\u5b58\u5728”\u00a0\u8fd9\u6761\u8bed\u53e5\u662f\u4e00\u4e2a\u6761\u4ef6\u8bed\u53e5\uff0c\u5b83\u6839\u636e\u00a0$?\u00a0\u7684\u503c\u8f93\u51fa\u4e0d\u540c\u7684\u4fe1\u606f\uff1a<\/p>\n
\u5982\u679c\u00a0$?\u00a0\u7b49\u4e8e\u00a050\uff0c\u5219\u8f93\u51fa “$1 \u5b58\u5728”\uff0c\u610f\u5473\u7740\u00a0$1\u00a0\u6240\u6307\u5411\u7684\u6587\u4ef6\u5b58\u5728\u3002<\/p>\n
\u5982\u679c\u00a0$?\u00a0\u4e0d\u7b49\u4e8e\u00a050\uff08\u5373\u7b49\u4e8e\u00a0100\uff0c\u56e0\u4e3a\u8fd9\u662f\u00a0fun \u51fd\u6570\u5728\u6587\u4ef6\u4e0d\u5b58\u5728\u65f6\u8fd4\u56de\u7684\u503c\uff09\uff0c\u5219\u8f93\u51fa “$1 \u4e0d\u5b58\u5728”\uff0c\u610f\u5473\u7740\u00a0$1\u00a0\u6240\u6307\u5411\u7684\u6587\u4ef6\u4e0d\u5b58\u5728<\/p>\n
[root@shell \/server\/scripts]$ cat fun6.sh \r\n#!\/bin\/bash\r\nfun(){ \r\n     if [ -f $1 ];then\r\n         return 50\r\n     else\r\n         return 100\r\n     fi \r\n}\r\nfun $1\r\nresult=$?\r\nif [ $result -eq 50 ];then\r\n     echo \"$1 \u6587\u4ef6\u5b58\u5728\"\r\nelif [ $result -eq 100 ];then\r\n      echo \"$1 \u6587\u4ef6\u4e0d\u5b58\u5728\"\r\nfi\r\n[root@shell \/server\/scripts]$ sh fun6.sh \/etc\/passwd\r\n\/etc\/passwd \u6587\u4ef6\u5b58\u5728\r\n[root@shell \/server\/scripts]$ sh fun6.sh \/etc\/passwdd\r\n\/etc\/passwdd \u6587\u4ef6\u4e0d\u5b58\u5728<\/pre>\n
fun\u00a0\u7684\u51fd\u6570\u6765\u68c0\u67e5\u6587\u4ef6\u662f\u5426\u5b58\u5728\uff0c\u5e76\u6839\u636e\u68c0\u67e5\u7ed3\u679c\u8fd4\u56de\u4e0d\u540c\u7684\u9000\u51fa\u72b6\u6001\u7801\u3002\u8fd9\u91cc\uff0c\u5982\u679c\u6587\u4ef6\u5b58\u5728\uff0c\u51fd\u6570\u8fd4\u56de\u00a050\uff1b\u5982\u679c\u6587\u4ef6\u4e0d\u5b58\u5728\uff0c\u51fd\u6570\u8fd4\u56de\u00a0100\u3002<\/p>\n
\u5728\u8c03\u7528\u00a0fun $1\u00a0\u540e\uff0c\u4f7f\u7528\u00a0result=$ ?\u00a0\u5c06\u51fd\u6570\u7684\u9000\u51fa\u72b6\u6001\u7801\u5b58\u50a8\u5230\u53d8\u91cf\u00a0result\u00a0\u4e2d\uff0c\u8fd9\u4f7f\u5f97\u5728\u540e\u7eed\u7684\u6761\u4ef6\u5224\u65ad\u4e2d\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u00a0result\u00a0\u53d8\u91cf\uff0c\u800c\u4e0d\u9700\u8981\u518d\u6b21\u4f7f\u7528\u00a0$?\u3002<\/p>\n
\u63a5\u4e0b\u6765\u7684\u00a0if [ $result -eq 50 ]; then echo “$ 1 \u6587\u4ef6\u5b58\u5728” elif [ $result -eq 100 ]; then echo “$ 1 \u6587\u4ef6\u4e0d\u5b58\u5728” fi\u00a0\u8fd9\u6bb5\u8bed\u53e5\u6839\u636e\u00a0result\u00a0\u7684\u503c\u8f93\u51fa\u4e0d\u540c\u7684\u4fe1\u606f\uff1a<\/p>\n
\u5982\u679c\u00a0result\u00a0\u7b49\u4e8e\u00a050\uff0c\u5219\u8f93\u51fa “1\u6587\u4ef6\u5b58\u5728”\uff0c\u610f\u5473\u7740\u20181\u6587\u4ef6\u5b58\u5728”\uff0c\u610f\u5473\u7740\u2018<\/span>1` \u6240\u6307\u5411\u7684\u6587\u4ef6\u5b58\u5728\u3002<\/p>\n
\u5982\u679c\u00a0result\u00a0\u7b49\u4e8e\u00a0100\uff0c\u5219\u8f93\u51fa “1\u6587\u4ef6\u4e0d\u5b58\u5728”\uff0c\u610f\u5473\u7740\u20181\u6587\u4ef6\u4e0d\u5b58\u5728”\uff0c\u610f\u5473\u7740\u2018<\/span>1` \u6240\u6307\u5411\u7684\u6587\u4ef6\u4e0d\u5b58\u5728<\/p>\n
[root@shell \/server\/scripts]$ cat fun7.sh \r\n#!\/bin\/bash\r\nfun(){ \r\n  \u00a0 \u00a0if [ -f $1\u00a0 ];then\r\n  \u00a0 \u00a0 \u00a0 return 50\r\n  \u00a0 \u00a0else\r\n  \u00a0 \u00a0   return 100\r\n  \u00a0 \u00a0fi\u00a0\r\n}\r\nfun $1\r\ncase $? in\r\n  \u00a0 \u00a0 \u00a0 \u00a050)\r\n  \u00a0echo \"$1 \u6587\u4ef6\u5b58\u5728\"\r\n  \u00a0 \u00a0 \u00a0 \u00a0;;\r\n  \u00a0 100)\r\n  echo \"$1 \u6587\u4ef6\u4e0d\u5b58\u5728\"\r\n;;\r\n*)\r\n  \u00a0 \u00a0 \u00a0 \u00a0echo USAGE\r\nesac\r\n\r\n[root@shell \/server\/scripts]$ sh\u00a0 fun7.sh\u00a0 \/etc\/passwd\r\n\/etc\/passwd \u6587\u4ef6\u5b58\u5728\r\n[root@shell \/server\/scripts]$ sh\u00a0 fun7.sh\u00a0 \/etc\/passwdd\r\n\/etc\/passwdd \u6587\u4ef6\u4e0d\u5b58\u5728<\/pre>\n
fun\u00a0\u51fd\u6570\u4e0e\u4e4b\u524d\u8ba8\u8bba\u7684\u76f8\u540c\uff0c\u5b83\u68c0\u67e5\u4e00\u4e2a\u6587\u4ef6\u662f\u5426\u5b58\u5728\uff0c\u5e76\u8fd4\u56de\u00a050\u00a0\u5982\u679c\u6587\u4ef6\u5b58\u5728\uff0c\u6216\u8005\u8fd4\u56de\u00a0100\u00a0\u5982\u679c\u6587\u4ef6\u4e0d\u5b58\u5728\u3002<\/p>\n
fun $1\u00a0\u8c03\u7528\u51fd\u6570\uff0c\u7136\u540e\u00a0$ ?\u00a0\u6355\u83b7\u51fd\u6570\u7684\u8fd4\u56de\u503c\u3002\u63a5\u4e0b\u6765\u7684\u00a0case $? in\u00a0\u8bed\u53e5\u68c0\u67e5\u00a0$ ?\u00a0\u7684\u503c\uff0c\u5e76\u6839\u636e\u5339\u914d\u7684\u503c\u6267\u884c\u76f8\u5e94\u7684\u4ee3\u7801\u5757\uff1a<\/p>\n
\u5982\u679c\u00a0$?\u00a0\u7684\u503c\u662f\u00a050\uff0c\u5219\u6267\u884c\u7b2c\u4e00\u79cd\u60c5\u51b5\uff0c\u8f93\u51fa “$1 \u6587\u4ef6\u5b58\u5728”\uff0c\u8868\u793a\u6587\u4ef6\u5b58\u5728\u3002<\/p>\n
\u5982\u679c\u00a0$?\u00a0\u7684\u503c\u662f\u00a0100\uff0c\u5219\u6267\u884c\u7b2c\u4e8c\u79cd\u60c5\u51b5\uff0c\u8f93\u51fa “$1 \u6587\u4ef6\u4e0d\u5b58\u5728”\uff0c\u8868\u793a\u6587\u4ef6\u4e0d\u5b58\u5728\u3002<\/p>\n
\u5982\u679c\u00a0$?\u00a0\u7684\u503c\u65e2\u4e0d\u662f\u00a050\u00a0\u4e5f\u4e0d\u662f\u00a0100\uff0c\u5219\u6267\u884c\u9ed8\u8ba4\u60c5\u51b5\uff08*)\uff09\uff0c\u8f93\u51fa “USAGE”\uff0c\u8fd9\u901a\u5e38\u7528\u4e8e\u5904\u7406\u672a\u9884\u671f\u7684\u60c5\u51b5\u6216\u9519\u8bef\u3002<\/p>\n
\u4f7f\u7528\u00a0case\u00a0\u8bed\u53e5\u7684\u7ed3\u6784\u53ef\u4ee5\u8ba9\u4f60\u66f4\u8f7b\u677e\u5730\u7ba1\u7406\u591a\u4e2a\u53ef\u80fd\u7684\u8fd4\u56de\u503c\uff0c\u5e76\u4e14\u4f7f\u5f97\u811a\u672c\u7684\u903b\u8f91\u66f4\u52a0\u6e05\u6670\u548c\u6613\u4e8e\u7ef4\u62a4\u3002\u7136\u800c\uff0c\u6b63\u5982\u4e4b\u524d\u6240\u63d0\u5230\u7684\uff0c\u4f7f\u7528\u975e\u6807\u51c6\u7684\u9000\u51fa\u72b6\u6001\u7801\uff08\u5982\u00a050\u00a0\u548c\u00a0100\uff09\u53ef\u80fd\u5728\u4e0e\u6807\u51c6\u7684 shell \u811a\u672c\u6216\u51fd\u6570\u4ea4\u4e92\u65f6\u9020\u6210\u95ee\u9898\u3002\u901a\u5e38\uff0c0\u00a0\u8868\u793a\u6210\u529f\uff0c\u975e\u00a00\u00a0\u7684\u503c\uff08\u5982\u00a01\uff09\u8868\u793a\u9519\u8bef\u6216\u7279\u5b9a\u72b6\u6001\u3002\u4e3a\u4e86\u63d0\u9ad8\u517c\u5bb9\u6027\u548c\u901a\u7528\u6027\uff0c\u63a8\u8350\u4f7f\u7528\u8fd9\u4e9b\u6807\u51c6\u503c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
1.Shell \u51fd\u6570\u6982\u8ff0 Shell \u548c\u5176\u4ed6\u8bed\u8a00\u4e00\u6837\uff0c\u4e5f\u6709\u51fd\u6570\uff0c\u5176\u672c\u8d28\u5c31\u662f\u4e00\u6bb5\u53ef\u4ee5\u590d\u7528\u7684\u4ee3\u7801\u3002\u5c06\u6570\u636e\u8fdb\u884c\u62bd\u79bb\u5904 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[25],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=\/wp\/v2\/posts\/1331"}],"collection":[{"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1331"}],"version-history":[{"count":8,"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=\/wp\/v2\/posts\/1331\/revisions"}],"predecessor-version":[{"id":1347,"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=\/wp\/v2\/posts\/1331\/revisions\/1347"}],"wp:attachment":[{"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1331"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1331"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.qiangzhenshuai.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1331"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}