一、语法一

for 变量 in 值1 值2 值3…
do
程序
done
#!/bin/bash
#打印时间
# Author: shenchao （E-mail: shenchao@lampbrother.net）
for time in morning noon afternoon evening
do
echo “This time is $time!”
done
#!/bin/bash
#批量解压缩脚本
# Author: shenchao （E-mail: shenchao@lampbrother.net）
cd /lamp
ls *.tar.gz > ls.log
for i in $(cat ls.log)
do
tar -zxf $i &>/dev/null
done
rm -rf /lamp/ls.log

二、语法二

for (( 初始值;循环控制条件;变量变化 ))
do
程序
done
#!/bin/bash
#从1加到100
# Author: shenchao （E-mail: shenchao@lampbrother.net）
s=0
for (( i=1;i<=100;i=i+1 ))
do
s=$(( $s+$i ))
done
echo “The sum of 1+2+…+100 is : $s”
#!/bin/bash
#批量添加指定数量的用户
# Author: shenchao （E-mail: shenchao@lampbrother.net）
read -p “Please input user name: “ -t 30 name
read -p “Please input the number of users: “ -t 30 num
read -p “Please input the password of users: “ -t 30 pass
if [ ! -z “$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/passwd —stdin $name$i &>/dev/null
done
fi
fi