Extracting a Pattern-Based Substring

There are various ways to obtain substring based on the patterns of the string:

• using cut command
• using awk command

Method 1: Using cut command

For demonstration, take input strings to be comma-separated values: “Romy, Pushkar, Kareena, Katrina”. (-d ,) option is to be used with cut command to tell the command that the input string is comma separated values. -f option tell the cut command to extract the string based on the field like (-f 3) is for third field in the string.

Syntax:

cut [option] field_position <<< "comma_seperated_string"

Code:

cut -d, -f 3 <<< “Romy,Pushkar,Kareena,Katrina”.

This will extract third field.

Output:

Method 2: using awk command

Syntax:

awk [option] field_separator ‘{print $field_position}’ <<< “input_string”

Code:

To extract third field from string

awk -F’,’ ‘{print $1}’ <<< “Romy,Pushkar,Kareena,Katrina”

Output:

sIn this article, we will discuss how to write a bash script to extract substring from a string.