#! /bin/bash## center - center a group of lines## tabs in the lines might cause this to look a little bit off##width=${COLUMNS:-80}if [[ $# == 0 ]]then	set -- /dev/stdinfifor filedo	while read -r	do		printf "%*s\n" $(( (width+${#REPLY})/2 )) "$REPLY"	done < $filedoneexit 0