从文件中选择偶数行

一个awk示例(作为 Mark's sed example ):

awk 'NR % 2 == 0' filename

例子:

$ cat filename
line 0
line 1
line 2
line 3
line 4
line 5
line 6
line 7
line 8

$ awk 'NR % 2 == 0' filename
line 1
line 3
line 5
line 7

sed -n 'n;p' filename

用 awk :

awk '{getline;print}' filename

用 bash :

#!/bin/bash
while read line
do
    read line
    echo $line
done < filename

如果你 sed 是GNU的:

sed -n 2~2p filename