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 using awk
Author: Peter Chiu 
Date:   28-10-01 18:39

(written by Peter Chiu but posted by Dan Langille)

another solution is:-

awk -F: '! /^#/ { print $1 }' /etc/passwd

-F: use colon as separator
! /^#/ not beginning with a #
print $1 print first field

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