1 # Correct string equality test with a bash if statement [me@linux ~]$ if [[ $myString1 == "$myString2" ]]; then echo "\$myString1 equals to \$myString2 with the string: $myString1"; else echo "\$myString1 and
仍为bash。从菜单或快捷方式[crtl-alt-t]打开终端提供交互式bash。从桌面或文件管理器运行的脚本,通过对话框“在终端中运行”将作为POSIXdash执行,除非... == for string equality, as that is abash-ism. Use = instead.bash/sh/dash /bin/bash是一款很好的全功能/适合交互的shell ...
let's take a look at the "if" statement used above. In it, we have a boolean expression. In bash, the "=" comparison operator checks for string equality. In bash, all boolean expressions are enclosed in square brackets. But what does the boolean expression actually test for?
Get started with Bash Shell script learning with practical examples. Also test your learning with practice exercises. Linux HandbookAbhishek Prakash Example 3: Check if string is null or empty in Bash Unlike some other languages like C++, in Bash you can check whether the string is null or emp...
Example 1: If statement in bash on string equality #!/bin/bash read-p"Enter a match word: "USER_INPUT if[[$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...
test "this string" = "that string" test 1 = 001 test 1 -eq 001 In each case, we usetheechocommandto print the return code of the last command. Zero means true, one means false. Using the equals sign "=" gives us a false response comparing 1 to 001. That's correct, because the...
string1 = string2 and string1 == string2 - The equality operator returns true if the operands are equal. Use the = operator with the test [ command. Use the == operator with the [[ command for pattern matching. string1 != string2 - The inequality operator returns true if the operands...
read -p "Enter the second string: " STR2 if [[ "$STR1" == "$STR2" ]]; then echo "The strings are equal." else echo "The strings are different." fiCopy 2. Run the script to test thecode: The script first prompts for the two strings and then outputs the result. ...
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. ...
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 for? Let's take a look at the left side. According ...