Example 1: If statement in bash on string equality #!/bin/bash read-p"Enter a match word: "USER_INPUT if[[$USER_INPUT=="hello"]];then echo"Hello to you as well" fi In this example above we use the basicIFcondition with a single test of string equality and then print some output...
This will test whether the variable$foois equal to the string*ar. It will work even if$foois empty because the quotation marks will force an empty string comparison. The quotes around*arwill prevent the shell from interpolating the glob. This is a true equality. 这将测试变量$ foo是否等于...
case "$string" in "$pattern" ) echo "found";; esac Run Code Online (Sandbox Code Playgroud) 小智 15 以下脚本逐行从名为"testonthis"的文件中读取,然后将每行与一个简单的字符串,一个带有特殊字符的字符串和一个正则表达式(如果它不匹配)进行比较,那么脚本将打印该行而不是. bash中的空间非常重要...
1 # Correct string equality test with a bash if statement [me@linux ~]$ if [[ $myString1 == "$myString2" ]]; then echo "\$myString1 equals to \$myString2 with the string: $myString1"; else echo "\$myString1 and \$myString2 are different with \$myString1=$myString1 and...
/bin/bash string1="MyString" string2="MyString" if [ "$string1" == "$string2" ] then echo "Equal Strings" else echo "Strings not equal" fi 💡 Pay Attention to the spaces There must be a space between the[and the variable name and the equality operator==. If you miss any of...
more useful, let's take a look at the "if" statement used above. In it, we have a boolean expression. In bash, the "=" comparison operator checks for string equality. In bash, all boolean expressions are enclosed in square brackets. But what does the boolean expression actually test ...
String equality 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, ...
When the `=~'operator is used, the string to the right of the operatoris matched as a regular expression. The&& and || operatorsdonot evaluate EXPR2ifEXPR1 is sufficient to determine the expression's value.Exit Status:0or1depending on value of EXPRESSION. ...
Lastly, the == operator is for checking string values for equality. ./whatIf.sh Equal! Not equal! Not equal! The if statement is used extensively in bash scripts, which means that you are going to see it many times in this guide. Loops The bash shell has support for loops, which ...
The until command is identical to the while command, except that the test is negated; the do list is executed as long as the last command in list returns a non-zero exit status. The exit status of the while and until commands is the exit status of the last do list command executed,...