11.Shell for循环 - morris131/morris-book GitHub Wiki

for循环

for循环一般格式为：

for 变量 in 列表
do
    command1
    command2
    ...
    commandN
done

列表是一组值（数字、字符串等）组成的序列，每个值通过空格分隔。每循环一次，就将列表中的下一个值赋给变量。in列表是可选的，如果不用它，for循环使用命令行的位置参数。

#!/bin/bash

for num in 1 2 3 4 5
do
  echo "The value is $num"
done

# chmod +x fornumber.sh
# ./fornumber.sh
The value is 1
The value is 2
The value is 3
The value is 4
The value is 5

#!/bin/bash

for str in 'This is a string'
do
    echo $str
done

# chmod +x forstring.sh
# ./forstring.sh
This is a string

#!/bin/bash

for FILE in $HOME/.bash*
do
   echo $FILE
done

# chmod +x forfile.sh
# ./forfile.sh
/root/.bash_history
/root/.bash_logout
/root/.bash_profile
/root/.bashrc