#!/bin/bash i=1 for ((;;)) do if [ $i -le 10 ] then echo "$i" let i++ else exit 0 fi done 输出结果 代码语言:javascript 代码运行次数:0 运行 AI代码解释 [root@localhost opt]# ./number.sh 1 2 3 4 5 6 7 8 9 10 5、shell中let命令 let 对
:当前shell进程中,上一个命令的返回值,如果上一个命令成功执行则$?的值为0,否则为其他非零值,常用做if语句条件 $$:当前shell进程的pid $!:后台运行的最后一个进程的pid $_:之前命令的最后一个参数 shell 中的变量还有一点特性,可以设置默认值,即为了防止一些意外导致变量成为空值而导致脚本崩溃。 (1)${var-...
命令: adb shell pm list packages -s 第三方应用 命令: adb shell pm list packages -3 包名包含某字符串的应用 比如要查看包名包含字符串mazhuang的应用列表,命令: adb shell pm list packages mazhuang 当然也可以使用 grep 来过滤: adb shell pm list packages | grep mazhuang 安装APK 命令格式: adb i...
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fi # 如果 num1 大于 num3,就把 num1 和 num3 对调,确保 num1 变量中存的是最小值 if [ $...
GitHub Discussionsis a feature to enable free and open discussions within the community for topics that are not related to code, unlike issues. This is an experiment we are trying in our repositories, to see if it helps move discussions out of issues so that issues remain actionable by the ...
# CustomLog "logs/access_log" combined </IfModule> <IfModule alias_module> # # Redirect: Allows you to tell clients about documents that used to # exist in your server's namespace, but do not anymore. The client # will make a new request for the document at its new location. # ...
The shell does not exit if the command that fails is part of the command list immediately following a while or until keyword, part of the test following the if or elif reserved words, part of any command executed in a&&or||list except the command following the final&&or||, any command...
if($a-gt2) {Write-Host"The value$ais greater than 2."}elseif($a-eq2) {Write-Host"The value$ais equal to 2."}else{Write-Host("The value$ais less than 2 or"+" was not created or initialized.") } 使用三元运算符语法 PowerShell 7.0 引入了使用三元运算符的新语法。 它遵循 C# 三元...
-in 運算子-in就像運算子一樣,-contains但集合位於右側。 PowerShell $array=1..6if(3-in$array) {# do something} 變化: -in不區分大小寫的比對 -iin不區分大小寫的比對 -cin區分大小寫的比對 -notin不區分大小寫不相符 -inotin不區分大小寫不相符 ...