ʹض (Redirection Operators)



ʹضĬλض򵽲ͬλáλüΪ

±г˿ڽضĲ


ض
˵


>
д뵽ļ豸ӡУдʾС


<
ļжǴӼж롣


>>
ӵļĩβɾļеϢ


>&
һд뵽һС

<&
һȡ벢д뵽һС

|
һжȡдһСҲܵ




Ĭ£ԴӼ̽루 STDIN ͵ Cmd.exeȻ Cmd.exe  STDOUT ͵ʾڡ


±гõľ
	


ִ˵


STDIN
0



STDOUT
1
ʾ


STDERR
2ʾ


UNDEFINED
3-9ЩӦó͸幤ߵ塣




 0  9 ǰ 10 ʹ Cmd.exe г򲢽ǰ 10 еκһض򵽸óҪָʹõľضǰþ֡δĬϵ < ض 0Ĭϵ > ض 1 >  < ֮󣬱ָҪȡдݵλáָļһеľ


Ҫָضоʹ (&) ַҪضľţ &#磬Խ 2 STDERRض򵽾 1 STDOUT


1<&2


ƾ 



ض & ԽһƵһָľ磬Ҫ dir ͵ File.txt ͵ File.txt룺


dir>c:\file.txt 2>&1


ƾʱԸƸþԭ״̬ԡ磬һֻʵԣþиֻԡܽһֻԵľΪһֻдԵľ


ض (<)



ҪӼ̻豸ضʹ < 磬Ҫ File.txt õ sort 룬룺 


sort<file.txt 


File.txt ݽĸ˳бķʽʾʾС


< Դ򿪾ֻʵָļԣʹøòļдϢ磬 <&2 ͼȡ 0 ĲʧܣΪ 2 ֻʴ򿪵ġ


ע

 0  < ض > ĬϾ
    


	
ض (>)

	
 е͵ʾڡʹ͵ӡҲʾʾϢʾ

 Ҫʾضļ豸ʹ > ʹøò磬Ҫ dir ض Dirlist.txt룺 

 dir>dirlist.txt 

  Dirlist.txt ڣCmd.exe ļ Dirlist.txt ڣCmd.exe ʹ dir 滻ļеϢ


Ҫ netsh routing dump Ȼ͵ Route.cfg,룺

netsh routing dump>c:\route.cfg


> Դ򿪾ֻдԵָļԣʹøòȡļ磬ʹض >&0 ͼд 1 ĲʧܣΪ 0 ֻʴ󿪵ġ

ע

 1  > ضĬϾ
    



	
ʹ <& ض͸


	
Ҫʹض <&ָļѾڡļڣCmd.exe ֻʽ򿪸ļȻļΪַ͵ͬӼһָ˾Cmd.exe ָľƵϵͳеľС


磬ҪԾ 0 ȡ STDINķʽ File.txt룺

<file.txt


Ҫ File.txtݷ͵ʾڣ STDOUT룺

sort<file.txt 


Ҫ File.txtȻ󽫾 1 STDOUT; 2 STDERRض Search.txt룺

findfile file.txt>search.txt 2<&1


ҪԾ 0 ȡ STDINķʽû 3룺

<&3


	
ʹ >& ض͸


	
ضļָеļCmd.exe ֻдʽļǸļݡָ˾Cmd.exe ļƵоС



Ҫû 3 Ƶ 1룺

>&3


Ҫ 2 STDERR ipconfig ض򵽾 1 STDOUTȻض Output.log룺

ipconfig.exe>>output.log 2>&1


	
ʹ >> ض׷


 ҪнӵļĩβʧļѴڵκϢʹĴںţ >>磬Խ dir ɵĿ¼б׷ӵ Dirlist.txt ļ 

 dir>>dirlist.txt 


Ҫ netstat ׷ӵ Tcpinfo.txt ĩβ룺

netstat>>tcpinfo.txt


	
ʹùܵ (|) 


	
ܵ (|) ȡһĬ STDOUTȻ䵼һУĬ STDIN磬Ŀ¼ࣺ

dir | sort

ڱУͬʱ sort ֱͣյ dir Ϊֹsort ʹ dir Ϊ룬Ȼ͵ 1 STDOUT


ϲض


 ͨϲļɸѡԶ磬ʹ洢LOGַļ: 

 dir /b | find "LOG" > loglist.txt 



dir ͨ find ɸѡַ͡ "LOG" ļΪļб磬NetshConfig.logLogdat.svd  Mylog.bat洢ļ Loglist.txt С
 

 Ҫͬʹöɸѡʹùܵ (|) ָɸѡ磬 C ϵÿĿ¼ԲҰ "LOG" ַļʾÿʾһ

 dir c:\ /s /b | find "LOG" | more 

 ùܵ (|) Խ Cmd.exe Ϊͨ find ɸѡ dir find ֻѡַ "LOG" ļmore ʾ find ѡļʾÿʾһйɸѡϸϢɸѡ



 
