The exit code of the last command you run For every Linux command you run on a shell, it must return an exit status. Usually, the exit status is represented with an integer number, where 0 means that the script/command worked successfully without errors. Any other number besides zero (0)...
(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...
格式:-X <command> 或--request <command> 说明:-X 参数允许用户显式指定要使用的 HTTP 方法(如 GET、POST、PUT、DELETE 等)。如果不使用 -X 参数,curl 默认使用 GET 方法。 示例: curl -X POST http://www.example.com/api/data 在这个例子中,curl 会向目标 URL 发送一个 POST 请求。 区别总结 功...
Bash's exit status is the exit status of the last command executed in the script. If no commands are executed, the exit status is 0. An attempt is first made to open the file in the current directory, and, if no file is found, then the shell searches the directories in PATH for ...
The exit status of the wait command is printed. $? is an internal Bash variable that holds the exit status of the last command executed. If you run the script, it will print something like this: PID: 36353 Exit status: 0 Here’s an example using the -n option: #!/bin/bash sleep ...
#POSIXforiin*.mp3;do[-e"$i"]||continuesome command"$i"done 如果你有使用引号[6]和避免单词拆分[7]的习惯,你完全可以避免很多错误。 注意下循环体内部的 "$i",这里会导致下面我们要说的另外一个比较容易犯的错误。 2. cp $file $target
insert-last-argument (M-., M-_) 與yank-last-arg 同義。 operate-and-get-next (C-o) 接受當前行,加以執行,從歷史中取出相對當前行的下一行進行編輯。 任何參數都被忽略。 edit-and-execute-command (C-xC-e) 啟動一個編輯器,編輯當前命令行,將結果作為 shell 命令運行。 Bash 將依次試著運行 $FC...
insert-last-argument (M-., M-_) 與yank-last-arg 同義。 operate-and-get-next (C-o) 接受當前行,加以執行,從歷史中取出相對當前行的下一行進行編輯。 任何參數都被忽略。 edit-and-execute-command (C-xC-e) 啓動一個編輯器,編輯當前命令行,將結果作爲 shell 命令運行。 Bash 將依次試着運行 $FC...
CommandDescription factor Display prime factors of specified integer numbers. false Do nothing, unsuccessfully. Exit with a status code indicating failure. fc Used to list, edit or re-execute the commands previously entered into an interactive shell. fc-cache Make font information cache after ...
Progress bars Get the list of functions in a script Bypass shell aliases Bypass shell functions Run a command in the backgroundAFTERWORDFOREWORDA collection of pure bash alternatives to external processes and programs. The bash scripting language is more powerful than people realise and most tasks ...