#!/bin/bash

#Program Description:

#Author: Created by ctu_lzq

#Date: //

FILE="/etc/passwd"

LINES=`cat $FILE |wc -l`

#for i in `seq  $LINES`;

for ((i=;i<=$LINES;i++));

do

    userlist=`sed -n "$i""p" $FILE|awk -F: '{print $1}'`

    uidlist=`sed -n "$i""p" $FILE|awk -F: '{print $3}'`

    echo "Hello,$userlist,your UID is $uidlist"

done

echo  "there are $LINES users"

结果如：
[root@study learnshell]# bash test.sh

Hello,root,your UID is 0

Hello,bin,your UID is 1

Hello,daemon,your UID is 2

Hello,adm,your UID is 3

Hello,lp,your UID is 4

Hello,sync,your UID is 5

Hello,shutdown,your UID is 6

Hello,halt,your UID is 7

Hello,mail,your UID is 8

Hello,uucp,your UID is 10

Hello,operator,your UID is 11

Hello,games,your UID is 12

Hello,gopher,your UID is 13

Hello,ftp,your UID is 14

Hello,nobody,your UID is 99

Hello,dbus,your UID is 81

Hello,usbmuxd,your UID is 113

Hello,rpc,your UID is 32

Hello,rtkit,your UID is 499

Hello,avahi-autoipd,your UID is 170

Hello,vcsa,your UID is 69

Hello,abrt,your UID is 173

Hello,rpcuser,your UID is 29

Hello,nfsnobody,your UID is 65534

Hello,haldaemon,your UID is 68

Hello,ntp,your UID is 38

Hello,apache,your UID is 48

Hello,saslauth,your UID is 498

Hello,postfix,your UID is 89

Hello,gdm,your UID is 42

Hello,pulse,your UID is 497

Hello,sshd,your UID is 74

Hello,tcpdump,your UID is 72

Hello,mysql,your UID is 27

Hello,nginx,your UID is 496