Conditions in bash scripting (if statements) - Linux Academy Blog https://linuxacademy.com/blog/linux/conditions-in-bash-scripting-if-statements/ Table of conditions The following table list the condition possibilities for both the single- and the double-bracket syntax. Save a single exception, th...
1、if语法格式 1.1 if格式 if condition; then commands; fi 1.2 else if 和 else if c...
If-statement-Bash-Script-Example if-else Statement 除了普通的 if 语句之外,我们还可以用 else 块扩展 if 语句。基本思想是,如果语句为真,则执行 if 块。如果语句为假,则执行 else 块。 Syntax : if [ condition_command ] then command1 command2 …….. last_command else command1 command2 …….. ...
Shell 支持任意数目的分支，当分支比较多时，可以使用 if elif else 结构，它的格式为：ifcondition1the...
shell if fi的意思 shell脚本中的if-fi结构是条件语句,用于根据条件来执行不同的代码块。if-fi结构的意思是,如果满足某个条件,则执行某些特定的操作,否则执行其他操作。在shell脚本中,if-fi结构通常如下所示: shell. if [ condition ] then. # 在这里执行条件成立时的操作。 else. # 在这里执行条件不成立时...
[shell script] if condition and Usage 我们先来看一段shell脚本, [ $# -lt2] &&{echo"Usage: $0 target store_dir">&2exit2} 这段代码真的很精简,专业而成熟; 其中包含的知识点有if条件,&&技巧,{}的块语块作用,重定向;
shell 中 if condition 博客分类: Shell F# 阅读更多 est command or [ expr ] is used to see if an expression is true, and if it is true it return zero(0), otherwise returns nonzero for false. Syntax: test expression OR [ expression ] Example: Following script determine whether ...
In this example, the script fails because there are no spaces between the brackets and the variables. The correct syntax isif [ $a -gt $b ]; then. Error: Incorrect Condition Another common error is using the wrong operator in the condition. For example, using ‘=’ instead of ‘-eq’...
shell脚本(8)-流程控制if 一、单if语法 1、语法格式: if[ condition ] #condition值为 then commands fi 1. 2. 3. 4. 2、举例: [root@localhost test20210725]# vim document.sh #!/usr/bin/bash #假如没有/tmp/abc这个文件夹,就创建一个if[ ! -d /tmp/abc ]...
In such cases, one-liners come in very handy. A one-liner is a single line of (Bash) code that executes an atomic task we may need to be done at a given moment. There are many advantages of single lines over their script counterparts: commonly adhere to the “one tool for one job...