In this quick tutorial, I’ll show you how to compare strings in Bash shell scripts. Bash string comparison syntax Here is how you compare strings in Bash. if [ "$string1" == "$string2" ] You can also use a string directly instead of using a variable. if [ "$string1" == "This...
<path to the script file>/First.sh We can run the script using the above method using the absolute path or using the relative path of the script ./First.sh. String variables in Bash We can use the assignment operator (=) in Bash scripts to declare and initialize any string in a varia...
[[$variable==|!="string"]] - Testifa given string conforms the specified glob/regex: [[$variable==|=~ pattern ]] - Testifa given variable is [eq]ual/[n]ot [e]qual/[g]reater [t]han/[l]ess [t]han/[g]reater than or [e]qual/[l]ess than or [e]qual to the specified num...
The pattern will match if it matches any part of the string. Anchor the pattern using the ‘^’ and ‘$’ regular expression operators to force it to match the entire string. The array variable BASH_REMATCH records which parts of the string matched the pattern. The element of BASH_REMATC...
declare -a string_array=("Hello world!" "How are you?" "Nice to meet you!" "How do you do?" ) # Read the array values with space for str in "${string_array[@]}"; do echo $str done 如何SSH到另一台主机并在其上运行几个命令?
Variable names with a dollar sign can also be used inside other strings in order to insert the value of the variable into the string: echo"I went to school in$the_empire_state." ## I went to school in New York. When writing a Bash script, the script gives you a few variables for...
Run the script and enter the strings when prompted: Enter first string: Linuxize Enter second string: Ubuntu Strings are not equal. Copy You can also use the logical and && and or || to compare strings: [[ "string1" == "string2" ]] && echo "Equal" || echo "Not equal" CopyNot...
script1.sh: #!/bin/bash # demonstrate variable scope 1. var1=blah var2=foo # Let's verify theircurrent valueecho $0 :: var1 : $var1, var2 : $var2 export var1 ./script2.sh # Let's see what they are now echo $0 :: var1 : $var1, var2 : $var2 ...
You can make a variable default back to a certain string when a variable isn't set like so: ${variable:-string} Take this example: echo "Hello ${name:-nobody}!" Since the variablenameis not set, it will be defaulted tonobodyand the command above will print "Hello nobody!". ...
1. Identify String Length inside Bash Shell Script ${#string} The above format is used to get the length of the given bash variable. $ cat len.sh #! /bin/bash var="Welcome to the geekstuff" echo ${#var} $ ./len.sh 24