定时修改用户密码

 1 #!/bin/bash -
 2 ### auth: Jin
 3 ### date: 20140311
 4 ### Desc: 创建没有写入权限的普通用户，创建修改随机密码脚本changepassword.sh并将脚本加入crontab 
 5 ### Usage: ./tmp.sh 
 6 
 7 #user and permit
 8 groupadd viewer && useradd viewer -g viewer && cat /proc/sys/kernel/random/uuid|passwd --stdin viewer && printf "umask 222\n" >> ~viewer/.bashrc && chmod 500 /home/viewer
 9 #ssh key
10 mkdir ~viewer/.ssh/ && cp ~root/.ssh/authorized_keys ~viewer/.ssh/
11 
12 
13 #change password shell
14 mkdir -p  /home/gbin && touch /home/gbin/changepassword.sh && chmod 750 /home/gbin/changepassword.sh
15 #content
16 shellcontent="#/bin/bash
17 ### auth: Jin
18 ### date: 20140311
19 
20 secret=\`cat /proc/sys/kernel/random/uuid | cut -d‘-‘ -f1,3,5\`
21 
22 passwd <<EOF
23 \$secret
24 \$secret
25 EOF
26 
27 if [ $? -eq 0 ];then
28         echo ‘Change password OK‘
29 else
30         echo ‘Change password fail‘
31 fi"
32 
33 cat > /home/gbin/changepassword.sh << EOF
34 $shellcontent
35 EOF
36 
37 #注意几个转意的地方
38 #add crontal
39 cat >> /var/spool/cron/root << EOF
40 0 2 * * * /home/gbin/changepassword.sh >> /home/gbin/changepassword.log 2>&1
41 EOF
42 
43 #test change password shell
44 /home/gbin/changepassword.sh >> /home/gbin/changepassword.log 2>&1 && cat /home/gbin/changepassword.log
45 
46 trap "rm -f ./tmp.sh;exit" 0