::显示文本前10行
sed 11,$d a.txt
::显示文本最后一行
sed -n $p a.txt
::显示文本最后一行
sed $!d a.txt

sed s/；/\n/g a.txt

sed -n "20,25p" a.txt

sed -n "p;n"  a.txt

sed -n "n;p"  a.txt

sed -e "s/爱你/【爱你】/g" -e "s/恨你/（恨你）/g" a.txt

sed "s/[%:^?<>*/\|&]/ /g" a.txt

sed "s/^ *//;s/ *$//" a.txt

sed "s/^/echo/" a.txt

sed "s/。$//" a.txt

sed "s/^[/t]*//;s/[/t]*$//;s/ //g" file

 sed "s/。\t*$//"
删正行
sed  "/。$/d"

sed -e "s/\(..........\).*/\1/" if.txt

:: 12，如果某行的行尾是以"。"结尾，就删除"。"
sed -e "s/。$//" a.txt | more

:: 13，如果某行多于10个字符，只显示每一行的前10个字符
sed -n "/........../{s/\(..........\).*/\1/p}" a.txt | more

1
sed -n -e "1,10p;$p" file
::1	用-n禁止输出，这样打印1到10和末行

2
sed -e "s/;/\n/g;s/,/\n/g;" file
::2	简单替换

3
sed -e "20,25!d" file
::3	同你第一个，20到25不清空

4
sed -e "s/.*//g;N;" file
::清空ps并读入下一行,偶行输出
sed -e "1!{s/.*//g;N}" file
::同上，只是跳过第一行，奇行输出

(想下面时出了好点的解决方法：
sed -e "p;N;d" file
::直接打印一行，多读一行，删，奇行输出
sed -e "1d;p;N;d" file
::偶行输出，每一行直接删掉
)


5、
简单替换，不重复了

6、
仍是简单替换，不说了，只是注意转义

7、
这个有点难度，目前还不知道怎么在正则里面表达汉字，同求解

8、
sed -e "N;s/\n//" file
::N读取下一行，替换掉换行符

9、
sed -e "1{x;d};${x;p;x;b};/^5/{x;G;s/\n//;x;b};x" file
::暂时用5代表“我”，用中文的总是不正常，原因未明，期待答案

10
sed -e "s/^\s*//;s/\s*$//;" file
::\s代表空字符，一般是空格和TAB

11、12略

sed -n "/^.\{10\}/p" a.txt

sed '$!N;s/\n/ /' a.txt

sed "s/^/000/" *.txt

sed -n "1!G;h;$p" a.txt

sed "n;n;n;n;G;" a.txt

sed -n "/^[a-z A-Z]*$/p" a.txt

sed -e "/^[a-zA-Z][a-zA-Z]*$/!d" file

sed -r -e "/^[a-zA-Z]+$/!d" file

F:\tptst>np file

F:\tptst>type file
adfadfadfasdfasdfadf
4trqefddafKKLFDK:D
JJDJEXDSLDD


da13431431
o9590415143
ABCDE
BDEFG
BBDkkDDlda

;adfazxx13!#$#
F:\tptst>sed -e "/^[a-zA-Z][a-zA-Z]*$/!d" file
adfadfadfasdfasdfadf
JJDJEXDSLDD
ABCDE
BDEFG
BBDkkDDlda

F:\tptst>sed -r -e "/^[a-zA-Z]+$/!d" file
adfadfadfasdfasdfadf
JJDJEXDSLDD
ABCDE
BDEFG
BBDkkDDlda

F:\tptst>type file
adfadfadfasdfasdfadf
4trqefddafKKLFDK:D
JJDJEXDSLDD

我你他
a你我
他abcd你我
人民的常b

da13431431
o9590415143
ABCDE
BDEFG
BBDkkDDlda

;adfazxx13!#$#
F:\tptst>sed -e "/^[a-zA-Z][a-zA-Z]*$/!d" file
adfadfadfasdfasdfadf
JJDJEXDSLDD
ABCDE
BDEFG
BBDkkDDlda

F:\tptst>sed -r -e "/^[a-zA-Z]+$/!d" file
adfadfadfasdfasdfadf
JJDJEXDSLDD
ABCDE
BDEFG
BBDkkDDlda

F:\tptst>sed --version
GNU sed version 4.1.5
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.

sed -n &qu ... [/quote]
[code]
:查找出多余10个字符的行 ,但只显示后面的10个字符
sed -n "/^.\{10\}/s/\(^.\{10\}\)\(.\{10\}\).*/\2/p" a.txt

:查找出多余10个字符的行，但只显示前10个字符
sed -n "/^.\{10\}/s/\(^.\{10\}\).*/\1/p" a.txt

 sed "10q" a.txt 

 sed -n "1,10p" a.txt 

 sed "1,10!d" a.txt 

 sed "11,$d" a.txt 

 sed "$!d" a.txt 

 sed -n "$p" a.txt 

 sed "s/；/\n/g;s/，/\n/g" a.txt 

 sed "20,25!d" a.txt 

 sed -n "20,25p" a.txt 

 sed -n "p;n" a.txt 

 sed -n "n;p" a.txt 

 sed "s/爱你/【爱你】/g;s/恨你/【恨你】/g" a.txt 

 sed "s/[%:^?<>*/\|&]/ /g" a.txt 

 sed -n "/^[\x21-\x7E]*$/p" a.txt 

 sed -n "/^[\x80-\xFF]*$/p" a.txt 

 sed -n "/[\x21-\x7E][\x80-\xFF]\|[\x80-\xFF][\x21-\x7E]/p" a.txt 

 sed "N;s/\n/ /" a.txt 

 sed ":a;$!N;s/\n我/我/;ta;P;D" a.txt 

 sed "s/^ *//;s/ *$//" a.txt 

 sed "s/^/echo/" a.txt 

 sed "s/。$//" a.txt 

 sed "s/\(^.\{10\}\).*/\1/" a.txt 

 sed ":a;/[0-9]/s/^.\{,19\}$/ &/;ta" a.txt 

 sed "1!G;h;$!d" a.txt 

 sed "/\n/!G;s/\(.\)\(.*\n\)/&\2\1/;//D;s/.//" a.txt 

 sed "n;n;n;n;G" a.txt 

 sed -n "G;s/\n/&&/;/^\(.*\n\).*\n\1/{P;d};s/\n//;h" a.txt 

@echo off
for /f "delims=" %%a in (a.txt) do (
	if /i defined %%a (echo %%a) else set %%a=a
)

 sed -e "s/^.\{,10\}$/&          /;s/\(^.\{11\}\) *$/\1/;s`\(^.....\)\(.....\)\(.*\)`\1/*\2*/\3`" a.txt 

@echo off
for /f "delims=" %%a in ('dir /a-d/b *.txt') do (
	sed "s/^/000/w tmp_.txt" "%%a"
	move tmp_.txt "%%a"
)

@echo off
for /f %%i in ('sed -n "$=" a.txt') do set number=%%i
:loop
set /a num+=1
set /a n=(%num%-1)*100+1
set /a m=100*%num%
sed "%n%,%m%w a_%num%.txt" a.txt
if %m% LSS %number% goto :loop

@echo off
for /f %%i in ('sed -n "$=" a.txt') do set num=%%i
:loop
set /a n+=1,count+=1
sed -n %n%p a.txt
set /a m=10+%n%
sed -n %m%p a.txt
if %count% EQU 10 set /a n+=10 & set count=0
if %n% LSS %num% goto :loop
pause

@echo off
for /f %%i in ('sed -n "$=" a.txt') do set num=%%i
for /f %%i in ('sed -n "$=" b.txt') do set num2=%%i
if %num% LSS %num2% set num=%num2%
:loop
set /a n+=1
sed -n %n%p b.txt>>ba_tmp.txt
sed -n %n%p a.txt>>ba_tmp.txt
if %n% LSS %num% goto :loop
move ba_tmp.txt b.txt

split -100 a.txt