echo “Command failed with exit code: $exit_code” fi “` 在这个例子中,我们使用了ls命令来示范。脚本首先执行ls命令,然后使用$?获取ls命令的返回值并将其赋值给变量exit_code。接下来,使用if语句判断exit_code的值,如果等于0,则打印”Command executed successfully”,否则打印”Command failed with exit code...
Stores the exit status in the variable 'exit_status'. Print the exit status code: echo "Exit status code: $exit_status" Prints the exit status code along with a descriptive message. $exit_status is the value of the exit status code captured in step 3. 2. Write a Bash script that che...
(If n is omitted, the exit status is that of the last command executed. ) 格式:$? 上一个命令的退出码。 格式:trap "commands" EXIT 退出时执行commands指定的命令。( A trap on EXIT is executed before the shell terminates.) 退出码(exit status,或exit code)的约定: 0表示成功(Zero - Success...
exit命令用于退出当前shell,在shell脚本中可以终止当前脚本执行。 常用参数 格式:exit n 退出。设置退出码为n。(Cause the shell to exit with a status of n.) 格式:exit 退出。退出码不变,即为最后一个命令的退出码。(If n is omitted, the exit status is that of the last command executed. ) 格式:...
true [[ 某东西(而非条件) ]] , 其status code是0: 这个确实可以看到输出: if 某某 ; then 某某 ; fi 圆括号/Parentheses/( subshell bash里, (POSIX里的定义基本一样) 下篇: 胆大路野:zsh的exit status, 分号/semicolon 和 && 以及 ||
$bash$exit256exit$echo$?0 If you use 257 as the exit code, your exit status is 1, and so on. If the exit code is a negative number, the resulting exit status is that number subtracted from 256. So, if your exit code is 20, then the exit status is 236. ...
Bash exit 指令 该exit命令以 N 状态退出 shell 程序。它具有以下语法: exit N 如果N未给出,则退出状态代码是最后执行的命令的退出状态代码。 在shell脚本中使用时,作为exit命令参数提供的值将作为退出代码返回给shell。 举例说明 命令的退出状态可用于条件判断语句。在以下示例中,如果在文件 filename 内使用grep找...
格式:trap "commands" EXIT 退出时执行commands指定的命令。( A trap on EXIT is executed before the shell terminates.) 退出码(exit status,或exit code)的约定: 0表示成功(Zero - Success) 非0表示失败(Non-Zero - Failure) 2表示用法不当(Incorrect Usage) ...
Exit Codes With Special Meanings Table E-1. Reserved Exit Codes Exit Code NumberMeaningExampleComments 1 Catchall for general errors let &qu
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