read命令交互式接收参数，来选择删除或者添加用户：

#!/bin/bash
#
# Date: 2017-12-12
# Author: Liemer_Lius

read -p "Please input your choice(add|del): " CHOICE
if [ $CHOICE == 'add' ]; then
  for i in user{1..3}; do
    if id $i &> /dev/null; then
      echo "User already exist. Skip..."
      continue
    else
      useradd -M -s /sbin/nologin $i
      echo "Add user $i finished."
    fi
  done
elif [ $CHOICE == 'del' ]; then
  for i in user{1..3}; do
    if ! id $i &> /dev/null; then
      echo "No such user $i. Skip..."
      continue
    else
      userdel -r $i &> /dev/null
      echo "Delete user $i finished."
    fi
  done
else
  echo "Wrong option. Usage: `basename $0` del|add"
fi

转载请注明：liutianfeng.com » read传入参数，删除或者添加用户的脚本（不用case）