LINUX shell编程

 common.sh

#获取当前时间
getTime(){
        currentDate=`date +%Y-%m-%d`
        currentTime=`date +%H:%M:%S`
        echo ${currentDate}" "${currentTime}
}

createuser.sh 

#!/bin/bash

#引入公共函数文件
source ./common.sh

#读取自定义用户文件
for line in $(cat users)
do
        #字符串分割
        OLD_IFS="$IFS"
        IFS=":"
        arr=($line)
        IFS="$OLD_IFS"

        username=${arr[0]}

        passwd=${arr[1]}

        group=${arr[2]}

        #判断用户组是否存在，不存在则创建
        cat /etc/group | grep "^$group">& /var/null
        if [ $? -ne 0 ]
        then
                groupadd $group
        fi

        #判断用户是否存在，不存在则创建
        cat /etc/passwd | grep "^$username">& /var/null
        if [ $? -ne 0 ]
        then
                useradd -g $group $username
                echo $passwd | passwd --stdin $username
        fi
done

echo "create user successfully $(getTime)"

 users

user001:user001pwd:testgroup

user002:user002pwd:group002

user003:user003pwd:testgroup

user004:user004pwd:group004