[gxlinux@localhost ~]$ cat sed
1.line one.
2.the second line.
3.the third.
4.this is line four.
5.five
6.this is the sixth sentence.
7.this is line seven.
8.eight and last.
[gxlinux@localhost ~]$ sed '/last/ p' sed #正则表达式
1.line one.
2.the second line.
3.the third.
4.this is line four.
5.five
6.this is the sixth sentence.
7.this is line seven.
8.eight and last.
8.eight and last.
[gxlinux@localhost ~]$ sed '/last/ p' sed -n
8.eight and last.
[gxlinux@localhost ~]$ sed '3,6 p' sed -n
3.the third.
4.this is line four.
5.five
6.this is the sixth sentence.
[gxlinux@localhost ~]$ sed '3,6 !p' sed -n
1.line one.
2.the second line.
7.this is line seven.
8.eight and last.
[gxlinux@localhost ~]$ sed '$ p' sed -n
8.eight and last.
[gxlinux@localhost ~]$ sed '3 q' sed
1.line one.
2.the second line.
3.the third.
[gxlinux@localhost ~]$ cat>print3
3,6 p
[gxlinux@localhost ~]$ sed -n -f print3 sed
3.the third.
4.this is line four.
5.five
6.this is the sixth sentence.
[gxlinux@localhost ~]$ cat zhiling
/one/ i\
first
/second/ a\
two
3,4 c\
gxl
linux
s/last/fedora/
[gxlinux@localhost ~]$ sed -f zhiling sed
first
1.line one.
2.the second line.
two
gxl
linux
5.five
6.this is the sixth sentence.
7.this is line seven.
8.eight and fedora.
[gxlinux@localhost ~]$ sed 's/last/fedora/p' -n sed
8.eight and fedora.
[gxlinux@localhost ~]$ sed 's/last/fedora/w temp' sed
1.line one.
2.the second line.
3.the third.
4.this is line four.
5.five
6.this is the sixth sentence.
7.this is line seven.
8.eight and fedora.
[gxlinux@localhost ~]$ cat temp
8.eight and fedora.

[gxlinux@localhost ~]$ cat>zhiling
2,$g #从第二行开始处理，将一个换行符和hold区中的内容追加到pattern区中之后（h与g相反，x交换pattern区与hold区内容）
h
$!d #不是最后一行 删除
#所有命令都是工作在pattern区，并且是一行一行的处理，读取一行到pattern区然后将pattern区中的内容显示出来
#读取第一行到pattern区，将pattern区中的内容复制到hold区，删除pattern区内容（hold区中为第一行）
#读取第二行到pattern区，将一个换行符和hold区中的内容追加pattern区中，然后将其存储到hold区中，删除pattern区内容（hold区中为第二行加第一行）
#读取第八行到pattern区，将一个换行符和hold区中的内容追加pattern区中，然后将其存储到hold区中（此时pattern区内容就是倒过来的了，然后输出）
[gxlinux@localhost ~]$ sed -f zhiling sed
8.eight and last.
7.this is line seven.
6.this is the sixth sentence.
5.five
4.this is line four.
3.the third.
2.the second line.
1.line one.

[gxlinux@localhost ~]$ cat>zhiling
h #将pattern区中的内容复制到hold区中，hold区中原有内容丢失
n #跳过，读取下一行
p
g #与h指令相反
p
#首先读入一行并将它存入到hold区，然后读入下一行并显示，再获取先前的行并显示它，接着处理后续两行
[gxlinux@localhost ~]$ sed -nf zhiling sed
2.the second line.
1.line one.
4.this is line four.
3.the third.
6.this is the sixth sentence.
5.five
8.eight and last.
7.this is line seven.

这么少点代码就实现了？？

将上面的东西添加了一些注释,那样会好懂一点.里面是一个word