One of the most common operations when working with strings in Bash is to determine whether or not a string contains another string. In this article, we will show you several ways to check if a string contains a substring. Using Wildcards The easiest approach is to surround the substring ...
Check if Two Strings are Equal Check if a String Contains a Substring Check if a String is Empty Comparing Strings with the Case Operator Lexicographic Comparison Conclusion Share: When writing Bash scripts you will often need to compare two strings to check if they are equal or not. Two stri...
Check if String starts with another String in Bash Read more → Get random number between 1 and 100 in Bash Read more → Using uuid Command Use uuid to generate a random string in Bash. Use uuid Command 1 2 3 cat /proc/sys/kernel/random/uuid | sed 's/[-]//g' | head -c...
In contrast, the -z checks if the mentioned string operand size is zero; it returns true if it is zero length. So [ $mobile_missing ] is equivalent to [ -n $mobile_missing ]. As long as $mobile_missing contains at least one character, it was evaluated as true. The expression was...
Using the “If -Z” Statement Sometimes, it is required to check if a string variable is empty or if it contains a string of zero length. There are many options in Bash to do this task. Using the “-z” option with the “if” statement is one of the ways to check whether a vari...
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echo "The string contains the NAP substring." else echo "The string doesn't contain the specified substring." fi 2. Run the script: The output states that the specified substring is a part of the string. Use the Regex Operator Another way to check for substrings is to use the=~regexop...
The syntax below will check to see if $var starts with the hashtag: Method 2: To see if a string contains a substring, use the following syntax: Note: the full stop (.) that comes before the asterisk (*) matches zero or more occurrences of any character that is not a newline chara...
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There is no in array operator in bash to check if an array contains a value. Instead, to check if a bash array contains a value you will need to test the values in the array by using a bash conditional expression with the binary operator =~. The string to the right of the operator...