Query !

tushar_pandey · 08-16-2012, 04:32 AM

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" !

piyush.sharma · 08-16-2012, 06:01 AM

Hope this will help you
ls | grep ^p.* > /path/to/file

tushar_pandey · 08-16-2012, 06:18 AM

@ 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 !

piyush.sharma · 08-16-2012, 06:29 AM

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

tushar_pandey · 08-16-2012, 06:35 AM

I am asking this , because i find this query in "Sir yashwant kanitkar's" unix book , that in one line solve this query !

piyush.sharma · 08-16-2012, 06:40 AM

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.

wigry · 08-16-2012, 07:40 AM

isn't tee command meant for this multiple redirection (console and file)

piyush.sharma · 08-16-2012, 07:47 AM

Quote:

Originally Posted by wigry

isn't tee command meant for this multiple redirection (console and file)

yes ! it works
ls | grep ^p.* |tee /path/to/file

TobiSGD · 08-16-2012, 07:55 AM

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

piyush.sharma · 08-16-2012, 08:08 AM

Quote:

Originally Posted by TobiSGD

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.

TobiSGD · 08-16-2012, 09:28 AM

Quote:

Originally Posted by piyush.sharma

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.