a-1
a-2
a-3
1-a
2-a
3-a
b-1
b-2
b-3
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sed -n "/a/p" a.txt
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sed -n "/^a/p" a.txt
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sed "/a/d" a.txt
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sed "/^a/d" a.txt
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sed "s/b/bathome/" a.txt
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sed "s/^a.*/bathome/" a.txt
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sed 1,5d a.txt
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sed -n 5,8p a.txt
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sed -e "s/a/A/" -e "/-1/d" -e "s/^b.*/bathome/" a.txt
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sed "/^3/!d" a.txt
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1-a a-1 aa
2-a a-2 aa
3-a a-3 aa
4-a a-4 aa
5-a a-5 aa
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sed "s/a/b/2" a.txt
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sed "s/a/b/g" a.txt
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sed "1,3s/a/b/3" a.txt
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sed -e "3,5s/a/b/1" -e "3,5s/a/b/3" a.txt
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sed "4!s/a/b/2" a.txt
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1:basktop at time to door

2:basktop at time to door

3:bathome is webbbs

4:you can not do it

5:yes you need to watch the game

6:he is write for bat

7:he is write for bat

8:you can not do it
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sed "/^$/d" a.txt
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sed $d a.txt
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sed "2,/write/d" a.txt
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sed "/need/a\批处理" a.txt
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sed "a\批处理" a.txt
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sed "i\批处理" a.txt
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sed "/write/i\批处理" a.txt
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sed -n -e "p" -e "n" a.txt
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sed -n -e "n" -e "p" a.txt
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sed -n "$=" a.txt
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we he she they
we he she they
they our his him my
we he she they
my me you your her
they our his him my
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sed "s/\(t\)\(h\)\(e\)\(y\)/\4\1\3\2/" a.txt
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sed "/\n/!G;s/\(.\)\(.*\n\)/&\2\1/;//D;s/.//" a.txt
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sed -n "G; s/\n/&&/; /^\([ -~]*\n\).*\n\1/d; s/\n//; h; P" a.txt
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sed -n "n;n;p" a.txt
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sed "/./=" a.txt|sed "/./N; s/\n/:/"
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sed "s/^/bathome/" a.txt
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sed G a.txt
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sed "G;G;G;G;G;G" a.txt
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sed "/me/G" a.txt
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sed "/me/{x;p;x;}" a.txt
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123456789
abcdefg
gfabced
1790562.4345
批处理 bat
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sed -e :a -e "s/^.\{1,79\}$/ &/;ta" a.txt
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sed -e a: -e "s/^.\{1,79\}$/ & /;ta" a.txt
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sed -n "/[0-9]/p" a.txt
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sed "y/abcdefg/ABCDEFG/" a.txt
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sed -e :a -e "s/\(.*[0-9]\)\([0-9]\{3\}\)/\1,\2/;ta" a.txt
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1:When I was a little girl, I found love in a box all because of a class assignment.
2:On a Friday night I made an announcement at the dinner table. 
3:The words bubbled out in a torrent of excitement I could no longer contain. 
4:“My teacher said we have to bring a box for our valentines on Monday. 
5:But it has to be a special box, all decorated.”
6:Mother said, “We’ll see,” and she continued eating.
7:I wilted faster than a flower with no water. 
8:What did “We’ll see” mean? 
9:I had to have that box or there would be no valentines for me. 
10:My second grade Valentine’s Day would be a disaster.
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sed "5,8c\pause" a.txt
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sed "1,$c\pause" a.txt
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sed "s/^....//" a.txt
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sed "s/....$//" a.txt
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sed "s/^/    /" a.txt
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sed "/./=" a.txt|sed "/./N; s/\n/:/"
::管道命令前面是把每行前插入一行 存放行号
::管道命令后面是在之前的命令结果基础上,把插入的行号之后的换行符替换成":"
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sed "/./=" a.txt|sed "/./n; s/\n/:/"
::如果把N换成n 的话 管道命令后面的sed不会执行也就是没有替换成功
::这里只显示管道命令前面的命令结果
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