For Loops Unlike most loops, the for loop does not test the condition of a variable each time it goes around the loop. Instead, it starts with a list of … - Selection from Shell Scripting: Expert Recipes for Linux, Bash, and More [Book]
当我们用编程语言编写一个 forloop时,我们正在构建一个迭代的命令式:我们要求计算机首先完成一个工作,然后循环到最后。但通过GNU Parallel编写命令时,我们遵循所谓的描述性功能编程。就是,我们尝试用模式描述我们想要的内容,然后让计算机填写该模式并输入完整命令。 GNU Parallel的极简介绍 GNU Parallel 是一个非常好用...
AIX sets this to either 0 for successful or non-zero for failure. This is excellent for Korn shell scripting. Listing 7 shows how the $? is set when you run valid and invalid AIX commands. Listing 7. How the $? is set for valid and invalid AIX commands $date Sat May 10 00:02:...
The Bourne shell’s while loop uses exit codes, like the if conditional. For example, this script does 10 iterations: Bourne shell 的 while 循环使用退出代码,就像 if 条件一样。例如,此脚本进行了 10 次迭代: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 #!/bin/sh FILE=/tmp/whiletest....
$tests= @{'Simple for-loop'= {param([int]$RepeatCount, [random]$RanGen)for($i=0;$i-lt$RepeatCount;$i++) {$null=$RanGen.Next() } }'Wrapped in a function'= {param([int]$RepeatCount, [random]$RanGen)functionGet-RandomNumberCore{param($rng)$rng.Next() }for($i=0;$i-lt$...
sub main Const ForReading = 1 Dim fs, ts Dim text_content Set g_shell = CreateObject("WScript.Shell") set fs = CreateObject("Scripting.FileSystemObject") loop_time = 99999 waitStrs_1 = Array("]#",">","]$") xsh.Screen.Synchronous = true '--- check if session is connected --- ...
|&是一个Bash扩展,已被弃用。它在sh模式下不受支持。无论如何,不要使用|&,忘记它的存在。使用2>&1 |。见https://wiki.bash-hackers.org/scripting/obsolete aws自动缩放组ec2实例以每分钟运行一次脚本 您需要在S3或Cloudwatch上存储脚本日志吗?然后使用EventBridge规则和SSM运行命令文档。 你不在乎这些日志吗?然...
《Linux Command Line and Shell Scripting Bible》Part 13 更多的结构化命令(for while until) for命令 基本语法格式 for var in list do commands done 也可以写成 for var in list; do commands done 读取列表中的值 1 2 3 4 5 6 7 8 9
Depending on your background, you may not see any immediate value to shell scripting as it relates to the DBA’s work. If you do not have experience with UNIX or UNIX-like systems, the myriad of cryptic commands might be cause for concern. Besides, in addition to being a relational ...
} //End ForEach loop. } // End of If if script exists. // If script block exists, see if this line matches any // of the match patterns. else { int patternIndex = 0; while (patternIndex < patterns.Length) { if ((simpleMatch && wildcardPattern[patternIndex].IsMatch(line...