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Old 08-16-2012, 05:32 AM   #1
tushar_pandey
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Query !


what command i have to use for this query ?

List all the files which are starting from p character , and store all of these files in another dir using "pipeline" !
 
Old 08-16-2012, 07:01 AM   #2
piyush.sharma
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Hope this will help you
ls | grep ^p.* > /path/to/file
 
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Old 08-16-2012, 07:18 AM   #3
tushar_pandey
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@ piyush sharma .

can you please tell me , that at the same time of sending that output to some file , can we display it in our screen !
 
Old 08-16-2012, 07:29 AM   #4
piyush.sharma
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I didn't get any other way, When redirection is used, all the text moves to that file.
you can try this :
ls | grep ^p.* > /path/to/file;cat /path/to/file
 
Old 08-16-2012, 07:35 AM   #5
tushar_pandey
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I am asking this , because i find this query in "Sir yashwant kanitkar's" unix book , that in one line solve this query !
 
Old 08-16-2012, 07:40 AM   #6
piyush.sharma
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It does the same in "one line", What you say? problem is if we were to do it in "one command". because after semicolon, this (cat) is a new command.
 
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Old 08-16-2012, 08:40 AM   #7
wigry
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isn't tee command meant for this multiple redirection (console and file)
 
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Old 08-16-2012, 08:47 AM   #8
piyush.sharma
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Quote:
Originally Posted by wigry View Post
isn't tee command meant for this multiple redirection (console and file)
yes ! it works
ls | grep ^p.* |tee /path/to/file
 
Old 08-16-2012, 08:55 AM   #9
TobiSGD
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The grep is unnecessary and can lead to false positives if there are files with a newline character in their name. Just do it this way:
Code:
ls p* | tee /path/to/file
 
Old 08-16-2012, 09:08 AM   #10
piyush.sharma
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Quote:
Originally Posted by TobiSGD View Post
The grep is unnecessary and can lead to false positives if there are files with a newline character in their name. Just do it this way:
Code:
ls p* | tee /path/to/file
It is entering directory as well, if name starts from p, and listing all files of that directory. This may or may not be desired.
 
Old 08-16-2012, 10:28 AM   #11
TobiSGD
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Quote:
Originally Posted by piyush.sharma View Post
It is entering directory as well, if name starts from p, and listing all files of that directory. This may or may not be desired.
You are right. If that behavior is not desired just add the -d option to the ls command.
 
  


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