The variable testing receives the output from the date command, and it is used in the echo statement to display it. Running the shell script produces the following output: 变量testing 接收 date 命令的输出,并在 echo 语句中显示它,运行 shell 脚本产生以下输出。 $ chmod u+x test5 $ ./test5 ...
set -e或者set -o errexit如果命令运行失败,脚本立即退出执行 set -u或者set -o nounset如果存在未声明(赋值)的变量,脚本立即退出执行(交互式shell不退出) set -o pipefail the return value of a pipeline is the status of the last command to exit with a non-zero status, or zero if no command e...
# Note that we use `"$@"'to let each command-line parameter expand to a # separate word. The quotes around `$@'are essential! # We need TEMPasthe `evalset--'would nuke the return value of getopt. #-o表示短选项,两个冒号表示该选项有一个可选参数,可选参数必须紧贴选项 #如-carg 而...
-o option-name Set the variable corresponding to option-name: allexport same as -a braceexpand same as -B emacs use an emacs-style line editing interface errexit same as -e errtrace same as -E functrace same as -T hashall same as -h histexpand same as -H history enable command histor...
-F参数在目录名后加了正斜线(/),以方便用户在输出中分辨它们。类似地,它会在可执行 文件(比如上面的my_script文件)的后面加个星号,以便用户找出可在系统上运行的文件。 把隐藏文件和普通文件及目录一起显示出来,就得用到-a参数。 -R参数是ls命令可用的另一个参数,叫作递归选项 ...
# "VARIABLE =value"# ^#% Script tries to run "VARIABLE" command with one argument, "=value".# "VARIABLE= value"# ^#% Script tries to run "value" command with#+ the environmental variable "VARIABLE" set to "".#---## 变量引用echohello# hello# Not a variable reference, just the s...
cp framework.sh myscript 1. 然后再插入自己的函数。 让我们来看看如下两个示例。 #p# 二进制到十进制的转换 脚本b2d 将二进制数 (比如 1101) 转换为相应的十进制数。这也是一个用expr命令进行数学运算的例子: 复制 #!/bin/sh # vim: set sw=4 ts=4 et: ...
set -o pipefail ,pipe 命令fail也会中断。 trap 'echo "Error at line $LINENO"; exit 1' ERR trap 'echo "Script interrupted by user"; exit 1' INT 我常用的shell 脚本 这里列出我经常用的shell脚本来说明它们有时候还是很方便和必要的。 一、Linux用于build project和run test。因为很多时候build需要...
So the script could be like this: #!/bin/bash mydir=$(pwd) echo $mydir You can store the output of the command in the mydir variable. Math calculation You can perform basic math calculations using $(( 2 + 2 )) format: #!/bin/bash ...
Set-TraceSource Set-Variable Show-Command Show-Markdown Sort-Object Start-Sleep Tee-Object Test-Json Trace-Command 解除封鎖檔案 Unregister-Event Update-FormatData Update-List Update-TypeData Wait-Debugger Wait-Event Write-Debug 寫入錯誤 Write-Host ...