合格linux运维人员必会的30道shell编程实践题及讲解-04

企业实践题4：
批量创建10个系统帐号oldboy01-oldboy10并设置密码（密码为随机8位字符串）。

我的脚本1=======================

[root@master day7]# cat shell_0301.sh 
#!/bin/bash
. /etc/init.d/functions
[ $UID -ne 0 ] &&{
echo "only allow root to exec this cmd."
exit
}

for n in `seq -w 10`
do
    pass="`echo $RANDOM|md5sum|cut -c 1-8`"
    useradd oldboy$n &>/dev/null &&\
    echo $pass|passwd --stdin oldboy$n &>/dev/null
    if [ $? -eq 0 ];then
        action "useradd oldboy$n" /bin/true
    else
        action "useradd oldboy$n" /bin/false
    fi
    echo -e "oldboy$n-t$pass" >> /oldboy.user.txt
done

我的脚本2=======================

[root@master day7]# cat shell_0302.sh

#!/bin/bash
echo stu{01..10}|tr " " "\n"|sed -r 's#(.*)#useradd \1;pass=$RANDOM|md5sum|cut -c 1-8;echo "$pass|passwd --stdin \1;echo -e "\1 \t `echo "$pass"`">> /tmp/oldboy.log"#g'|bash