trap cleanupSIGINTSIGTERMERREXITscript_dir=$(cd"$(dirname "${BASH_SOURCE[0]}")"&>/dev/null&&pwd-P)usage(){cat<<EOFUsage:$(basename"${BASH_SOURCE[0]}")[-h][-v][-f]-p param_value arg1[arg2...]Script description h
$ bash script.sh bar 可以看到,echo $a输出了一个空行,Bash 忽略了不存在的$a,然后继续执行echo bar。...脚本在头部加上它,遇到不存在的变量就会报错,并停止执行。 #!/usr/bin/env bash set -u echo $a echo bar 运行结果如下。...set -o nounset 三、set -x 默认情况下,脚本执行后,屏幕只显示...
This will clone the repository and install the new versions of scripts that were installed, if you didn’t install a certain tool this script will not install the new version of that tool. Uninstalling AUR pacman -Rns bash-snippets # or bash-snippets-git APT Package Manager sudo apt ...
# An similar program using the tcsh(1) script language can be found # as parse.tcsh # Example input and output (from the bash prompt): # ./parse.bash -a par1 'another arg' --c-long 'wow!*\?' -cmore -b " very long " # Option a # Option c, no argument # Option c, argu...
The most common runtime errors in a shell script include: Division by zero or use of a string/float variable in a Bash Arithmetic Expression Incorrect subscript when dynamically populating a Bash Associative Array Parsing incorrectly a file or command output like when processing a CSV file in ...
$ printf “%s\n” “$SCRIPT” Bash 通过使用“$0”来找到脚本的名字,在脚本被拷贝和重新命名之后,就不会出现错误文件名的潜在威胁了。SCRIPT总是保持这正确的脚本名。 变量“$#”包含有脚本或外壳会话参数的个数。如果没有参数,$#总是0。这个参数没有将脚本名包含在$0中。
[student@workstation~]$file zcatzcat:POSIX shell script,ASCII text executable 4、使用wc命令和Bash快捷键显示zcat的大小。wc命令可用于显示zcat脚本中的行数、字数和字节数。使用Bash历史记录快捷键Esc+.(同时按Esc和.键)来重用上一命令中的参数，而不是重新键入文件名。[student@workstation-]$wc Esc+.[...
# command command ls 在后台运行命令 这将运行给定命令并使其保持运行,即使在终端或SSH连接终止后也是如此。忽略所有输出。 bkr() { (nohup "$@" &>/dev/null &) } bkr ./some_script.sh # some_script.sh is now running in the background...
# An similar program using the tcsh(1) script language can be found # as parse.tcsh # Example input and output (from the bash prompt): # ./parse.bash -a par1 'another arg' --c-long 'wow!*\?' -cmore -b " very long " ...
$ regex "red" '^(#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3}))$' # no output (invalid)在脚本中的示例:is_hex_color() { if [[ $1 =~ ^(#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3}))$ ]]; then printf '%s\n' "${BASH_REMATCH[1]}" else printf '%s\n' "error: $1 is ...