shell笔记一（函数和参数）

#!/bin/bash function test_command() { echo "The params list in test is $@" echo "The params count in test is $#" echo "The \$1 cmd is $1" cmd=$1 echo "==========$cmd execute output below ========" $cmd # run the command ret=$? echo "==========$cmd execute output finish ========" if [ $ret -eq 0 ] then echo "$cmd executed successfully" else echo "$cmd executed failed" fi echo "============================================" } echo "The program params list:$@" echo "The program params count is $#" test_command "$1" test_command $1 测试 ls -l命令

codefire@aliyun:~/workspace/shell_script$ ./success_test.sh "ls -l"

The program params list:ls -l The program params count is 1 The params list in test is ls -l The params count in test is 1 The $1 cmd is ls -l ==========ls -l execute output below ======== total 4 -rw-rw-r-- 1 codefire codefire   0 Nov 19 14:50 a.txt -rwxrwxrwx 1 codefire codefire 572 Nov 19 15:37 success_test.sh ==========ls -l execute output finish ======== ls -l executed successfully ============================================ The params list in test is ls -l The params count in test is 2 The $1 cmd is ls ==========ls execute output below ======== a.txt  success_test.sh ==========ls execute output finish ======== ls executed successfully

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测试a+b

codefire@aliyun:~/workspace/shell_script$ ./success_test.sh "a+b" The program params list:a+b The program params count is 1 The params list in test is a+b The params count in test is 1 The $1 cmd is a+b ==========a+b execute output below ======== ./success_test.sh: line 8: a+b: command not found ==========a+b execute output finish ======== a+b executed failed ============================================ The params list in test is a+b The params count in test is 1 The $1 cmd is a+b ==========a+b execute output below ======== ./success_test.sh: line 8: a+b: command not found ==========a+b execute output finish ======== a+b executed failed ============================================