在Bash脚本中,条件可以是各种各样的表达式,比如判断两个变量是否相等,判断一个文件是否存在,或者判断一个命令的返回值是否为0。下面是一些常见的条件表达式的示例: ```bash # Check if two variables are equal if [ $var1 -eq $var2 ] then echo "Variables are equal" else echo "Variables are not equa...
true if the Strings are equal, case sensitive, or both null org.apache.commons.lang.StringUtils equalsIgnoreCase方法 写道 public static boolean equalsIgnoreCase(String str1, String str2) Compares two Strings, returning true if they are equal ignoring the case. nulls are handled without exceptions. ...
Example 2: Check if strings are not equal in Bash Instead of checking the quality, let’s do the opposite and check the inequality. Bash also provides the negation operator so that you can easily use “if not equal” condition in shell scripts. if [ "$string1" != "Not MyString" ] ...
Line 7checks if the variablesiandjare equal ($i -eq $j). If they are, thecontinue 2statement resumes the outer loop at the next iteration. However, if the values are different, the program continues as expected. Run the script to see the program output. Each time the two values are ...
Now you are ready to execute your first bash script: ./hello_world.sh 2. Simple Backup bash shell script #!/bin/bash tar -czf myhome_directory.tar.gz /home/linuxconfig 3. Variables In this example we declare simple bash variable and print it on the screen ( stdout ) with echo comman...
局部变量(local variables):这种变量只有在变量所在的代码块或者函数中才可见,需要使用local声明; 全局变量:Bash中用户自定义的普通变量默认是全局变量,可以在本文件中的其它位置引用; 环境变量(environmental variables):所有的程序(包括shell启动的程序)都能访问环境变量。 如果一个shell脚本设置了环境变量,需要用 export...
To check if two strings are not equal, use!=operator. $ [[ $X != $Y ]] && echo "Not Equal" || echo "Equal" Not equal to operator Conclusion In this article, we have seen how towork with conditional statements in Bash. We have also seen how to use file test, integer, and st...
Check if strings are equals The '=' operator checks if string1 equals string2. If the two strings are equal, then it returns 0; if the two strings are not equal, then it returns 1: $ [ "sam" = "SAM" ] && echo $? || echo $?
Thetestcommand in Linux evaluates conditional expressions and often pairs with theBash if statement. There are two variations for the test syntax: test 2 -gt 3; echo $? Or alternatively: [ 2 -gt 3 ]; echo $? Thetestcommand evaluates whether two is greater than (-gt) three. If the ex...
$ bash ifnot.sh Let’s update this code a little bit by adding the same value to both integer variables i.e., v1=14 and v2=14. This time, we have also updated the inner condition for two variables. So, we have been using the “not equal” operator i.e., “-ne” to check ...