awk -F: 'BEGIN{printf "%-15s%-7s%s\n%-s\n", "Username","UID","GID","=========================="} $3 >= 500 && $3 != 65534 {printf "%-15s%-7s%s\n", $1,$3,$4} END{printf "%s\n%s\n", "==========================","List Over"}' /etc/passwd
%-15s左对齐%-7s左对齐%s\n换行%-s\n左对齐换行
Username UID GID
==========================
messagebus 100 101
haldaemon 101 102
sshd 71 65
mysql 60 111
==========================
List Over
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