Bash, short for "Bourne Again SHell," is a powerful scripting language used in Unix-based operating systems. One of the fundamental constructs in Bash programming is the if statement. The if statement allows you to control the flow of your script based on specific conditions. In this article,...
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五花八门的语法一直让我无比纠结,一般编程语言的 if 语句说明都不过半页,但是 bash 的 if 语句,我看了好几本书和教程,都没搞清楚,不能一口气就能写出来,而是要翻教程和看以前的代码,反复调试。 最后是靠Advanced Bash-Scripting Guide这本书搞清楚的。 条件部分的意义 很多教程都这么说:condition的代码执行后,...
你所看到的是if语句的第一行,它在检查变量的值是否真的等于12。如果是的话,语句就会停止,并发出numberTwelve is equal to 12的回显,然后在fi之后继续执行你的脚本。如果变量大于12的话,就会执行elif语句,并在fi之后继续执行。当你使用if或if/elif语句时,它是自上而下工作的。当第一条语句是匹配的时候,它会停...
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TL;DR: How Do I Use ‘Else If’ in Bash Scripting? 'Else if'in bash scripting, often written as'elif', is used to check multiple conditions in your code. It is used with the syntax,if [firstStatement]; then... elif [secondCondition]; then... else. It’s a powerful tool that ...
if (( $digit1 -ne $digit2 )); then echo "test" fi I get this error message: line 32: ((: 1 -ne 2 : syntax error in expression (error token is "2 ") ** I have digit set to 2 bash shell if-statement scripting Share Improve this question Follow edited Apr 20, 2014 at ...
9.1. Simple Bash if/else statement Please note the spacing inside the [ and ] brackets! Without the spaces, it won't work! #!/bin/bash directory="./BashScripting" # bash check if directory exists if [ -d $directory ]; then
对于自动化运维，诸如备份恢复之类的，DBA经常需要将SQL语句封装到shell脚本。本文描述了在Linux环境下mysql...
For example, if I had an 'apple', I would want to make sure it's still an 'apple' and not an 'orange' because I don't like Oranges! The syntax for an if statement is if [something] then elif then elif then ...etc... else fi The else if statement or (elif) is not...