#!/bin/bash
#load system functions
[ -f /etc/init.d/functions ] && . /etc/init.d/functions
for i in `seq -w 10`
do
#generate passwd,8 random chars
passwd=`echo $(date +%t%N)$RANDOM|md5sum|cut -c 2-9`
#check wheather the username is in the /etc/passwd
#important awk use the shell variable
check=`awk -F ':' '/^'gccmx$i'/ {print $1}' /etc/passwd`
if [ -z "$check" ];then
useradd gccmx$i &>/dev/null && user_status=$
echo $passwd | passwd --stdin gccmx$i &>/dev/null && passwd_status=$
else
user_status=1
passwd_status=1
fi
if [ "$user_status" -eq 0 -a "$passwd_status" -eq 0 ];then
action "The user gccmx$i is add successfully!" /bin/true
echo -e "username:gccmx${i}\tpassword:${passwd}" >>/tmp/userinfo.txt
else
action "The user gccmx$i is add faild!" /bin/false
echo -e "username:gccmx${i}\tpassword:${passwd}" >>/tmp/faild_info.txt
fi
unset user_status && unset passwd_status
sleep 1
done

运行效果（gccmx05，已经存在，所以添加失败，用户名密码信息存储在/tmp/user_info.txt里）：

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