简单的几个shell脚本六_在linux系统下写一个简单的shell脚本程序，运行后在屏幕上显示"hello, shell !-优快云博客

本文链接：https://blog.youkuaiyun.com/momomumu123/article/details/45966787

本文介绍了一种通过Shell脚本批量添加和删除用户的自动化方法。该脚本支持两种模式：添加用户模式(--add)和删除用户模式(--del)，并提供了一个帮助选项(--help)来指导用户如何正确使用这些功能。

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1、添加100个用户

#/bin/bash
#
if [ $# -lt 1 ];then
     echo "Usage:./7.sh --add|--del"
     exit 7
fi
if [ "$1" == "--add" ];then
for I in {1..100};do
   if id user$I &> /dev/null;then
      echo "user$I exists."
   else
     useradd user$I
     echo "user$I" |passwd --stdin &> /dev/null
     echo "Add user$I finished."
   fi
done
elif [ "$1" == "--del" ];then
    for I in {1..100};do
    if ! id user$I &> /dev/null;then
      echo "No user$I"
    else
     userdel -r user$I
     echo "user$I deleted."
    fi
done
else
    echo "Unknown ARG:[--add|--del]"
    exit 8
fi

2、添加用户使用参数和帮助

#!/bin/bash
#
if [ "$1" == "--add" ];then
for I in `echo $2 |sed 's/,/ /g'`;do
   if id $I &> /dev/null;then
   echo "$I exists."
   else
   useradd $I
   echo $I|passwd --stdin $I &> /dev/null
   echo "add $I finshed."
   fi
done
elif [ "$1" == "--del" ];then
    for I in `echo $2|sed 's/,/ /g'`;do
      if id $I &>/dev/null;then
      userdel -r $I
      echo "$I deleted."
    else
      echo "No user $I"
      fi
    done
elif [ "$1" == "--help" ];then
     echo "Usage:adminuser2.sh --add USER1,USER2,... | --del USER1,USER2,... | --help"
else
     echo "No options. you can: --help"
fi
3、组合测试示例

#/bin/bash
#
if [ "$1" == "q" -o "$1" == "Q" -o "$1" == "Quit" -o "$1" == "quit" ];then
   echo "quiting..."
   exit 4
else
   echo "Unknow options."
   exit 1
fi