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(If n is omitted, the exit status is that of the last command executed. ) 格式:$? 上一个命令的退出码。 格式:trap "commands" EXIT 退出时执行commands指定的命令。( A trap on EXIT is executed before the shell terminates.) 退出码(exit status,或exit code)的约定: 0表示成功(Zero - Success...
If you want to get the exit code To get the exit code of any command, use the “$?” variable alongside the echo command or printf command. Example: The “0” return code indicates that the command was successful. It implies that the file “intro.txt” exists and the Linux/UNIX syste...
#!/bin/bash # 定义要运行的命令 command_to_run="your_command_here" # 设置最大重试次数 max_attempts=3 # 设置初始重试次数 attempts=0 # 循环运行命令直到成功或达到最大重试次数 while true; do # 运行命令 $command_to_run # 检查命令的退出状态码 exit_code=$? # 如果命令成功执行,退出循环 if ...
alias canhas="sudo apt-get install -y" GPG 签名 有时候,我必须在没有 GPG 扩展程序或应用程序的情况下给电子邮件签署 GPG 签名,我会跳到命令行并使用以下令人讨厌的别名: alias gibson="gpg --encrypt --sign --armor"alias ungibson="gpg --decrypt" Docker ...
We will first discuss using a simple if statement to get the exit status, after which we will discuss alternatives and shorthand notations for getting the exit status. Check Exit Code in Bash The exit status is essentially an integer that tells us whether or not the command succeeded. Non-...
When you execute a command or run a script, you receive an exit code. An exit code is a system response that reports success, an error, or another condit...
bash 和 zsh 命令行终端都非常流行,后者尤为“精妙”。这两个终端的关键命令很相似,而对于经常使用它们的人来说,了解这些省时省力的快捷键命令 -- 大部分是用来对当前命令行进行快速导航或编辑的,将会事半功倍。 要移动到当前行的开头,使用 [Ctrl][A] ...
Bash Cheatsheetgithub.com/skywind3000/awesome-cheatsheets/blob/master/languages/bash.sh 对于一些...
$ bash gettopts.sh -a t.sh: illegal option --a The first switch isSWITCH=? OPTARG= OPTIND=1 错误信息可以在开关列表的第一字符前加一个冒号进行隐藏,通过使用“:hc:”,使用错误开关-a时就不会显示错误了,但是该错误开关会被保存在OPTARG中,以便自定义错误信息用。