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#!/bin/bash
s="false,false,false,true"
sed -E ':a;s/(,|^)false(,|$)/\1N\2/;ta; :b;s/(,|^)true(,|$)/\1Y\2/;tb' <<< "$s"

Success #stdin #stdout 0s 4504KB

stdin

Standard input is empty

stdout

N,N,N,Y

https://ideone.com/qDVNZb

language:

Bash (bash 5.0.3)

created:

visibility:

secret

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