$FUNCNAME、$LINENO、$PWD FUNCNAME和LINENO变量经常用于脚本的调试 FUNCNAME表示当前函数的名字,作用范围仅限函数中使用,在函数外无值 LINENO表示当前所在脚本中变量出现在的行号 PWD表示当前目录, 对应于pwd命令 现有个脚本a.sh内容如下 1#!/bin/bash2 3 4 testa() 5 { 6echo'func='$FUNCNAME,$LINENO7 }...
-f file exists and is a regular file. -g file exists and has its setgid(2) bit set. -G file exists and has the same group ID as this process. -k file exists and has its sticky bit set. -L file exists and is a symbolic link. -n string length is not zero. -o Named option...
As it turns out,nothing. Our script is fine. Its location is the problem. Back in Chapter 12, we discussedthe PATH environment variable and its effect on how the system searches for executableprograms. To recap, the system searches a list of directories each time it needs to find anexecuta...
As it turns out,nothing. Our script is fine. Its location is the problem. Back in Chapter 12, we discussedthe PATH environment variable and its effect on how the system searches for executableprograms. To recap, the system searches a list of directories each time it needs to find anexecuta...
So the script could be like this: #!/bin/bash mydir=$(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 ...
this is a file created by shell. we want to make a good world. EOF 其中,<<EOF 表示当遇到EOF时结束输入。 cat>test1<<EOF 这间没有空格 http://kevingo75.blogspot.com/2011/08/shell-script-echoapppend.html 在編寫Shell Script時,如果你有echo到某個檔案的需求,你希望寫入檔案時是以附加(append...
Let’s say we want to save the shebang of our uname.sh script into the shebang variable. We can achieve this using the command: $ read shebang < <(cat uname.sh) $ echo "$shebang" #!/bin/shCopy The “<” operator is an input file descriptor that we use to provide an input ...
Now we can read the contents of a file into a variable, which we can then split on every newline character and iterate over the resulting array. After that, it’s a simple matter of using JavaScript’s match method to look for the word or phrase we want: ...
Set-Variable [-Name] <String[]> [[-Value] <Object>] [-Include <String[]>] [-Exclude <String[]>] [-Description <String>] [-Option <ScopedItemOptions>] [-Force] [-Visibility <SessionStateEntryVisibility>] [-PassThru] [-Scope <String>] [-WhatIf] [-Confirm] [<CommonParameters...
即使使用Using:範圍修飾詞,在案例中ForEach-Object -Parallel也不支援PipelineVariable一般參數變數。 範例17:在巢狀平行腳本區塊中傳遞變數 您可以在限定範圍的 scriptblock 之外ForEach-Object -Parallel建立變數,並在 scriptblock 內搭配Using:範圍修飾詞使用它。 從 PowerShell 7.2 開...