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#!/bin/bash if [ $# -lt 1 ] then echo "Usage: $0
" echo "Example: $0 file.txt" exit fi cat $1|while read line do l="$(echo $line|tr '[:upper:]' '[:lower:]')" if [[ $l == *"hello"* ]] || [[ $l == *"brother"* ]] then echo "$line" else echo "$line"|sed 's/[0-9]/X/g' fi done
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