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#!/bin/bash
s="a
b
c"
 
awk '{ print NR==1 ? $0"," : $0 }' <<< "$s"
 
sed '1s/$/,/' <<< "$s"

Success #stdin #stdout 0s 23336KB

stdin

copy

Standard input is empty

stdout

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a,
b
c
a,
b
c

https://ideone.com/wxiinl

language:

Bash (bash 5.0.3)

created:

visibility:

public

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