3.批量创建用户

#!/bin/bash
USER_NAME=$@
for USER in $USER_NAME;do
    if ! id $USER &>/dev/null; then
    PASS=`echo $RANDOM |md5sum |cut -c 1-10`
    useradd $USER
        chage -d 0 $USER
    echo $PASS |passwd --stdin $USER
    echo "$USER   $PASS" >>/tmp/user_info
    echo "用户创建成功"
    else
    echo "用户已经存在"
    fi
done