Shell Loop-Art
一、Loopfor loop syntax：
1、数字范围语法
for VARIABLE in 1 2 3 4 5 .. N
do
command1
command2
commandN
done
或者
for VARIABLE in file1 file2 file3
do
command1 on $VARIABLE
command2
commandN
done
或者
for OUTPUT in $(Linux-Command)
do
command1 on $OUTPUT
command2 on $OUTPUT
commandN
done
二、Examples
1、例一
#!/bin/bash
for i in 1 2 3 4 5
do
echo "Welcome $i times"
done
输出：
Welcome 1 times
Welcome 2 times
Welcome 3 times
Welcome 4 times
Welcome 5 times
2、例二
#!/bin/bash
for i in {1..5}
do
echo "Welcome $i times"
done
输出：
Welcome 1 times
Welcome 2 times
Welcome 3 times
Welcome 4 times
Welcome 5 times
3、例三
#!/bin/bash
for i in {0..10..2}
do
echo "Welcome $i times"
done
注意：{START..END..INCREMENT}
输出：Welcome 0 times
Welcome 2 times
Welcome 4 times
Welcome 6 times
Welcome 8 times
Welcome 10 times
三、seq command
#!/bin/bash
for i in $(seq 1 2 20)
do
echo "Welcome $i times"
done
输出： 1
3
5
7
9
四、三个表达式
for (( EXP1; EXP2; EXP3 ))
do
command1
command2
command3
done
例：
#!/bin/bash
for (( c=1; c
页:
[1]