$ awk -F: 'BEGIN{OFS="~";} {print $1, $3, $4;}' /etc/passwd
root~0~0
bin~1~1
daemon~2~2
adm~3~4
lp~4~7
sync~5~0
shutdown~6~0
... ...
tcpdump~72~72
beyes~500~500
mockbuild~501~501
apache~48~48
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