Linux系统批量添加用户，从一个文件中读取用户列表

#!/bin/bash
#Function: Add system user from a file list
#Author: Mach
#Email: mach_aly@aliyun.com
#Modify time: 04.10/2017, refactoring
#Modiry time: 04.15/2017, add function Filteruser()

Adduser(){
    if [ ! -f $1 ]; then
        echo "Error: $1 file non-existent."
        exit 1
    fi
    Filteruser $1
    for NM in $(cat $1)
    do
        useradd $NM && echo "Add user $NM successful."
    done
}

Filteruser(){
    rm exisuserlist.log > /dev/null 2>&1
    for NM in $(cat $1)
    do
        grep -w "^$NM" /etc/passwd > /dev/null 2>&1
        if [ "$?" -eq 0 ]; then
            echo -e "user '$NM' has existent.\n" | tee -a ./exisuserlist.log
        fi
    done
    if [ -f exisuserlist.log ]; then
        echo "Please handle the above user name.(./exisuserlist.log)"
        exit 1
    fi
}

Addgroup(){
    grep -w "^$2" /etc/group > /dev/null 2>&1
    if [ "$?" -ne 0 ]; then
        useradd -Ms /bin/fales $2 && echo "Add UNIgroup $2 successful."
        echo -e "$(id -gn $2) (unified IDnum group)\n" >> ./newadduserlist.log
    fi
    for NM in $(cat $1)
    do
        usermod -G $2 $NM && echo "Add user $NM to group $2 successful."
    done
}

PDandlog(){
    for NM in $(cat $1)
    do
        echo -en "$NM\t\t$(id -Gn $NM)\t\t" >> ./newadduserlist.log
        PD=`echo $RANDOM | md5sum | head -c 8`
        echo $PD | tee -a ./newadduserlist.log | passwd --stdin $NM
        echo -e "\n" >> ./newadduserlist.log
    done
}

if [ "$UID" -ne 0 ]; then
    echo "Error: Need root permission!"
    exit 1
fi

case $# in
    1)
        Adduser $1
        PDandlog $1
        ;;
    2)
        Adduser $1
        Addgroup $1 $2
        PDandlog $1
        ;;
    *)
        echo "Error: Parameters error."
        echo "usage: $0 UserListFile [GroupName]"
        ;;
esac