批量创建用户并生成随机密码
批量的创建用户，并对每个用户创建不同的密码；
实例一：密码是随机数生成；
#!/bin/bash
rm -f user.log
for i in `seq -w 5 15`
do
pass=`echo $RANDOM|md5sum|cut -c 1-8`
useradd user$i && echo "$pass" | passwd --stdin user$i
echo -e "user:user$i \t pass:$pass" >>user.log
done
[root@test02 Shell]# more user.log
user:user05 pass:aa3905cc
user:user06 pass:68379def
user:user07 pass:6e8d7289
user:user08 pass:ee9adb7c
user:user09 pass:57abd6ab
user:user10 pass:c75b6bf7
user:user11 pass:f1f84021
user:user12 pass:e72d67ba
user:user13 pass:d6f7f0e7
user:user14 pass:490a8500
user:user15 pass:032e1cee
注：删除创建的用户： for i in `seq -w 5 15`; do userdel -r user$i; done
实例二：用mkpasswd生成安全密码；
#!/bin/bash
rm -f user.log
for i in `seq -w 5 15`
do
pass=`mkpasswd`
useradd user$i && echo "$pass" | passwd --stdin user$i
echo -e "user:user$i \t pass:$pass" >>user.log
done
[root@test02 Shell]# more user.log
user:user05 pass:vuVXe76z?
user:user06 pass:Wyxk35xE(
user:user07 pass:Q9eA8p#sb
user:user08 pass:Ar42[Xunx
user:user09 pass:0ZCfaef6{
user:user10 pass:djN3hd#E9
user:user11 pass:mQ9yEzm4>
user:user12 pass:fszK*77oH
user:user13 pass:&y4xp1aUY
user:user14 pass:9Gl7qpSt:
user:user15 pass:33aU|vFik
注：mkpasswd命令 yum install -y expect-5.44.1.15-5.el6_4.x86_64 ；