Bash script - how to insert value of variable as new line, 2 line after matching a pattern in text file

Question

I want to add value of variable as new line, 2 line after matching a pattern. Below is the example.

Below is contents of line before adding value of variable as new line,2 line after matching pattern "FILTER datalist"

FILTER datalist

{

"DEBAU00_NFS_fmabackup_BBTFLRBAU01"

}

FILTER copylist

{

}

Below is the desired result , in case value of variable is Laptop.

FILTER datalist

{

"DEBAU00_NFS_fmabackup_BBTFLRBAU01"

Laptop

}

I have tried below.

sed '/^FILTER datalist/{N;N;s/$/\Laptop/}' file_name

Answer 1

Use sed with branching to achieve your objective.

$ cat casefile48486676
FILTER datalist

{

"DEBAU00_NFS_fmabackup_BBTFLRBAU01"

}

FILTER copylist

{

}
$ variable="Laptop\n\n" #bash variable
$ sed -E "/FILTER datalist/{:l1;/^}$/! {n;bl1};s/(^.*$)/$variable\1/}" casefile48486676

Output

FILTER datalist

{

"DEBAU00_NFS_fmabackup_BBTFLRBAU01"

Laptop

}

FILTER copylist

{

}