[FIXED] Using sed to add text after a pattern, but the added text comes from a list file

Issue

How can I use sed to locate a string, and add text from another file after the string?

File 1:

stage ('Clone Repo31') {

        steps {
                git credentialsId: '', url: '/stash/scm/'
        }
    }
    stage ('Zip Repo31') {
        steps {
        sh"""
            tar --exclude='*.tar' -cvf .tar *
        """
        }
    }
    steps {
            git credentialsId: '', url: '/stash/scm/'
    }
}
stage ('Zip Repo32') {
    steps {
    sh"""
        tar --exclude='*.tar' -cvf .tar *
    """
    }
}

File 2:

randomRepo.git
differentRandomRepo.git

I want to be able to use sed to read the second file, and add the contents of each line from the second file after each occurance of stash/scm/

Desired output:

       stage ('Clone Repo31') {

        steps {
                git credentialsId: '', url: '/stash/scm/randomRepo.git'
        }
    }
    stage ('Zip Repo31') {
        steps {
        sh"""
            tar --exclude='*.tar' -cvf .tar *
        """
        }
    }
    steps {
            git credentialsId: '', url: '/stash/scm/differentRandomRepo.git'
    }
}
stage ('Zip Repo32') {
    steps {
    sh"""
        tar --exclude='*.tar' -cvf .tar *
    """
    }
}

Can this be done with sed? I'm having issues reading it from a list file and it's confusing since it has a lot of slashes in it. I've been able to use normal sed substitution but I don't know how to do substitution by reading another file.

Solution

This is a bash script that uses sed and reads File_2 (The file containing the replacements) line by line, thus reading one replacement at a time. I then replaced the lines in File_1 with a sed script.

while IFS= read -r line; do
    sed -i "0,/\/stash\/scm\/'/{s|/stash/scm/'|/stash/scm/${line}'|}" File_1.txt
done < File_2.txt

Some tricks used to do this:

1. sed '0,/Apple/{s/Apple/Banana/}' input_filename Replace only the first occurrence in filename of the string Apple with the string Banana
2. Using double quotes for the sed script to allow for variable expansion ${line}
3. Making sure the search string to replace was being changed each iteration. This was done by including the ending single quote char ' for the search argument in the sed script s|/stash/scm/'|
4. Reading a file line by line in a bash script

while IFS= read -r line; do
    echo $line
done < File_2.txt

Read File line by line in bash

Answered By - Lenna
Answer Checked By - Mary Flores (JavaFixing Volunteer)