In Bash scripts,set -ecauses the script to exit immediately if any command exits with a non-zero status (unless the command that fails is part of an `if` statement, part of awhileoruntilloop, or if the command’s return status is being inverted with!). This is useful for debugging a...
shellcheck script.sh 其中,script.sh是要检测的bash脚本文件。 使用bash内置的调试功能。可以在bash脚本中添加以下代码,启用调试功能: 代码语言:txt 复制 set -x 这个命令会在每个执行的命令前打印出命令的内容,可以帮助找到程序错误。 使用trap命令。可以在bash脚本中添加以下代码,捕获程序错误并输出错误信息: 代码语...
When you execute a command or run a script, you receive anexit code. An exit code is a system response that reports success, an error, or another condition that provides a clue about what caused an unexpected result from your command or script. Yet, you might never know about the code,...
When you execute a command or run a script, you receive anexit code. An exit code is a system response that reports success, an error, or another condition that provides a clue about what caused an unexpected result from your command or script. Yet, you might never know about the code,...
exit[n] Bash Copy Here,[n]represents an exit status that the script returns to the shell or parent script. This is an optional parameter. If not provided, the exit command will return the status of the last command executed. Let’s look at a simple example: ...
Without any command-line arguments, the value of$1will be empty. When your script callsmkdir, it won't be passing an argument to it, and the mkdir command will return that error. To avoid this, you can check for the condition yourself and present a more friendly error: ...
1.Create a new file with the.shextension. You can create the file directly from text editors and save it. I am using thetouchcommand to create the file. $ touch /home/${USER}/first_script.sh 2.Grant execute permission to the script. ...
$0 -- "script.sh" $1 -- "param1" $2 -- "param2" $3 -- "param3" $4 -- "param4" $@ -- array of all positional parameters 这些变量可以在脚本中的任何地方使用,就像其他全局变量一样 退出状态码 任何一个命令执行完成后都会产生一个退出状态码,范围0-255,状态码可以用来检查错误 0 表示正...
# function ls # command command lscommand命令 调用指定的指令并执行,命令执行时不查询shell函数。command命令只能够执行shell内部的命令。在后台运行命令这将运行给定命令并使其保持后台运行,即使终端或SSH连接中断后也是如此。但是会忽略所有输出。bkr() { (nohup "$@" &>/dev/null &) } bkr ./some_script...
I would like to do something if the output of a shell script contains the string "Caddy 2 serving static files on :2015". This is what I have so far but the beach ball is just spinning. It seems it is because of the last command in my bash script which starts a server. There is...