Bash Scripting – Substring | expression returns the length of the string | Call Functions in Bash

Bash Scripting – Substring, There are a few ways to extract a substring in Bash. One way is to use the cut command. The cut command can be used to cut out sections of a string, based on character position or delimiter. To extract a substring using the cut command, you use the -c flag. The -c flag specifies the character positions to extract. For example, to extract the first five characters of a string, you would use the following command: Bash cut -c 1-5 "Hello, world!" Use code with caution. Learn more This would extract the substring "Hello" from the string "Hello, world!". You can also use the cut command to extract a substring based on a delimiter. For example, to extract the first field of a string that is delimited by commas, you would use the following command: Bash cut -d "," -f 1 "Last name, first name" Use code with caution. Learn more This would extract the substring "Last name" from the string "Last name, first name". Another way to extract a substring in Bash is to use the expr command. The expr command can be used to perform mathematical operations on strings. To extract a substring using the expr command, you use the substr function. The substr function takes three arguments: the string to extract the substring from, the starting position of the substring, and the length of the substring.