Get content between two substrings using bash script – Code Example

Code Example –

#!/bin/bash

extract() {
    # Usage: extract file "opening marker" "closing marker"
    while IFS=$'\n' read -r line; do
        [[ $extract && $line != "$3" ]] &&
            printf '%s\n' "$line"

        [[ $line == "$2" ]] && extract=1
        [[ $line == "$3" ]] && extract=
    done < "$1"
}

Suppose you have a text file – myfile.txt with this content –

This is the first line <>
This text will be extracted
</>
This is the last line

Extracting text between <> and </>

extract ~/Downloads/myfile.txt '<>' '</>'

Output –

This text will be extracted