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...
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....
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("]#",">","]$") xsh.Screen.Synchronous = true '--- check if session is connected --- ...
Depending on your background, you may not see any immediate value to shell scripting as it relates to the DBA’s work. If you do not have experience with UNIX or UNIX-like systems, the myriad of cryptic commands might be cause for concern. Besides, in addition to being a relational ...
Shell scripting is not the solution for every problem. It important to recognize that many aspects of the operating system can be monitored and modified from within the database. Oracle’s fixed views (the views with a v$ prefix) can be used to determine the host name of the machine (v$...
《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
Shell scripting What is Shell? Shell is responsible to read the command provided by the user. Shell will check if the command is valid or not. Shell will check if the command is properly used or not. If everything is ok, the shell will interpret that command into kernel understandable for...
基本for-loop示例是性能的基线。 第二个示例将随机数生成器包装在紧密循环中调用的函数中。 第三个示例在函数内移动循环。 该函数只调用一次,但代码仍生成相同的随机数。 请注意每个示例的执行时间差异。 Output复制 CollectionSize Test TotalMilliseconds RelativeSpeed --- --- --- --- 5120 for-loop in...
Summary: Microsoft Scripting Guy, Ed Wilson, talks about using the Windows PowerShellForeachstatement to loop through a collection. Microsoft Scripting Guy, Ed Wilson, is here. When the Scripting Wife and I were in Amsterdam, Windows PowerShell MVP, Jeff Wouters, told me that a lot of people...