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[service@gan .ssh]$ uname -a
Linux gan 2.4.21-20.EL #1 SMP Wed Aug 18 20:34:58 EDT 2004 x86_64 x86_64 x86_64 GNU/Linux
gan.cublog.cn
[service@gan .ssh]$ sed -V
GNU sed version 4.0.7
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE,
to the extent permitted by law.
1>. 替换普通字符
[service@gan .ssh]$ cat file.txt
1A1A
2B2B
3C3C
gan.cublog.cn
默认就替换第一个字符
[service@gan .ssh]$ sed 's/1/X/' file.txt
XA1A
2B2B
3C3C
指定只替换第2个字符
[service@gan .ssh]$ sed 's/1/X/2' file.txt  
1AXA
2B2B
3C3C
替换所有字符
[service@gan .ssh]$ sed 's/1/X/g' file.txt 
XAXA
2B2B
3C3C
2>. 替换特殊字符
注意：替换中sed使用的符号全部是""符号不是''的
[service@gan .ssh]$ cat sp.txt
A"/`!B\C'*&%#@~()?{}|+_-=:;K
[service@gan .ssh]$ sed "s/\"/X/" sp.txt
AX/`!B\C'*&%#@~()?{}|+_-=:;K
[service@gan .ssh]$ sed "s/\//X/" sp.txt 
A"X`!B\C'*&%#@~()?{}|+_-=:;K
[service@gan .ssh]$ sed "s/\`/X/" sp.txt 
A"/X!B\C'*&%#@~()?{}|+_-=:;K
[service@gan .ssh]$ sed "s/\!/X/" sp.txt 
A"/`XB\C'*&%#@~()?{}|+_-=:;K
gan.cublog.cn
[service@gan .ssh]$ sed "s/\\\/X/" sp.txt  
A"/`!BXC'*&%#@~()?{}|+_-=:;K
[service@gan .ssh]$ sed "s/'/X/" sp.txt   
A"/`!B\CX*&%#@~()?{}|+_-=:;K
[service@gan .ssh]$ sed "s/*/X/" sp.txt 
A"/`!B\C'X&%#@~()?{}|+_-=:;K
[service@gan .ssh]$ sed "s/
A"/`!B\C'*X>&%#@~()?{}|+_-=:;K
[service@gan .ssh]$ sed "s/>/X/" sp.txt 
A"/`!B\C'*X&%#@~()?{}|+_-=:;K
[service@gan .ssh]$ sed "s/&/X/" sp.txt 
A"/`!B\C'*X%#@~()?{}|+_-=:;K
[service@gan .ssh]$ sed "s/%/X/" sp.txt 
A"/`!B\C'*&X#@~()?{}|+_-=:;K
[service@gan .ssh]$ sed "s/#/X/" sp.txt 
A"/`!B\C'*&%X@~()?{}|+_-=:;K
[service@gan .ssh]$ sed "s/@/X/" sp.txt 
A"/`!B\C'*&%#X~()?{}|+_-=:;K
[service@gan .ssh]$ sed "s/~/X/" sp.txt 
A"/`!B\C'*&%#@X()?{}|+_-=:;K
[service@gan .ssh]$ sed "s/(/X/" sp.txt   
A"/`!B\C'*&%#@~X)?{}|+_-=:;K
[service@gan .ssh]$ sed "s/)/X/" sp.txt 
A"/`!B\C'*&%#@~(X?{}|+_-=:;K
[service@gan .ssh]$ sed "s/?/X/" sp.txt 
A"/`!B\C'*&%#@~()X{}|+_-=:;K
[service@gan .ssh]$ sed "s/{/X/" sp.txt 
A"/`!B\C'*&%#@~()?X}|+_-=:;K
[service@gan .ssh]$ sed "s/}/X/" sp.txt 
A"/`!B\C'*&%#@~()?{X|+_-=:;K
[service@gan .ssh]$ sed "s/|/X/" sp.txt 
A"/`!B\C'*&%#@~()?{}X+_-=:;K
[service@gan .ssh]$ sed "s/+/X/" sp.txt 
A"/`!B\C'*&%#@~()?{}|X_-=:;K
[service@gan .ssh]$ sed "s/_/X/" sp.txt 
A"/`!B\C'*&%#@~()?{}|+X-=:;K
[service@gan .ssh]$ sed "s/-/X/" sp.txt 
A"/`!B\C'*&%#@~()?{}|+_X=:;K
[service@gan .ssh]$ sed "s/=/X/" sp.txt 
A"/`!B\C'*&%#@~()?{}|+_-X:;K
[service@gan .ssh]$ sed "s/:/X/" sp.txt 
A"/`!B\C'*&%#@~()?{}|+_-=X;K
[service@gan .ssh]$ sed "s/;/X/" sp.txt 
A"/`!B\C'*&%#@~()?{}|+_-=:XK
gan.cublog.cn
3>. 对应多个替换
[service@gan .ssh]$ cat file.txt
1A1AA1
2B2B
3C3C
12345678
23456789
[service@gan .ssh]$ sed 's/123/ABC/' file.txt
1A1AA1
2B2B
3C3C
ABC45678
23456789
gan.cublog.cn
对应的一次全部替换：1->A，2->B，3->C
[service@gan .ssh]$ sed 'y/123/ABC/' file.txt 
AAAAAA
BBBB
CCCC
ABC45678
BC456789
4>. 在sed替换中使用正侧表达式
要了解下面的东西最好先了解正侧表达式的，该功能可以让sed功能大大增强。
下面的替换我全部采用替换成X字符吧，当然如果你需要替换成空那就把X去掉就可以了（起到删除字符的作用，其实它还是一个字符替换的）
[service@gan .ssh]$ cat file.txt
1A1AA1
2B2B
3C3C D
   12345678 M
23456789
在每行的开头插入X字符
[service@gan .ssh]$ sed 's/^/X/' file.txt 
X1A1AA1
X2B2B
X 3C3C D
X   12345678 M
X23456789
在每行的结尾插入X字符
[service@gan .ssh]$ sed 's/$/X/' file.txt 
1A1AA1X
2B2BX
3C3C DX
   12345678 MX
23456789X
将每行的开头的空格替换成X
[service@gan .ssh]$ sed 's/^ /X/' file.txt 
1A1AA1
2B2B
X3C3C D
X  12345678 M
23456789
将每行开头的多个（一个或0个）空格替换成一个X字符
[service@gan .ssh]$ sed 's/^ */X/' file.txt
X1A1AA1
X2B2B
X3C3C D
X12345678 M
X23456789
[service@gan .ssh]$ sed 's/^[ ]*/X/' file.txt
X1A1AA1
X2B2B
X3C3C D
X12345678 M
X23456789
将每行包含有空格的字符替换成X
[service@gan .ssh]$ sed 's/^[ ][ ]*/X/' file.txt
1A1AA1
2B2B
X3C3C D
X12345678 M
23456789
对于sed在字符替换部分写的可能还不是很全面，慢慢添加吧。。。

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