批量添加删除指定数量的用户

一 for循环语法
for((初始值;循环控制条件;变量变化))
do
程序
done
 
二 实例1
#!/bin/bash
s=0
for (( i=1;i<=100;i=i+1 ))
do
s=$(( $s+$i ))
done
echo $s
 
三 实例2
#!/bin/bash
read -p "please input user name" -t 30 name
read -p "please input number of users:" -t 30 num
read -p "please input the password of users:" -t 30 pass
if [ ! -z "$name" -a ! -z "$num" -a ! -z "$pass" ]
then
y=$(echo $num | sed 's/[0-9]//g')
if [ -z "$y" ]
then
for((i=1;i<=$num;i=i+1))
do
/usr/sbin/useradd $name$i &>/dev/null
echo $pass|/usr/bin/passed --stdin $name$i &>/dev/null
done
fi
fi
 
四 实例3
#!/bin/bash
for i in $(cat /etc/passwd |grep /bin/bash|grep -v root |cut -d ":" -f1)
do
echo $i
userdel -r $i
done