trying to grep -v multiple changing sequences from a file Post: 302362251

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Top Forums UNIX for Dummies Questions & Answers trying to grep -v multiple changing sequences from a file Post 302362251 by MykC on Thursday 15th of October 2009 11:11:18 AM

10-15-2009

Registered User

You might already have your answer, but for my own curosity I'm just trying to understand it as well.

Input: File
Output = Input - lines that contain the specified sequences.
Sequences: You can have any number of sequences each time and each sequence can be of any length?
sequence1 - 1234
sequence2 - 5678
sequence3 - AAAA

Your current code is: n= the number of sequences.

Code:

grep -v sequence1 input file | grep -v sequence2 | grep -v sequence3 | grep -v sequenceN > newfile

So, he would take the sequences that he's given, put them in a file, then run:

Code:

grep -v -f sequence file input file

And to output to a new file just add > newfile at the end of the above grep code? Or would it be | cat >> newfile?
I'm not sure what the above code is that isn't the "$grep -f list -v text" line. What topic is that if I wanted to understand it?

Last edited by MykC; 10-15-2009 at 12:21 PM..

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zgrep

ZGREP(1)						      General Commands Manual							  ZGREP(1)

NAME

       zgrep - search possibly compressed files for a regular expression

SYNOPSIS

       zgrep [ grep_options ] [ -e ] pattern filename...

DESCRIPTION

       Zgrep  invokes  grep  on  compressed  or  gzipped  files.   These  grep	options  will  cause  zgrep  to  terminate  with  an  error  code:
       (-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*).  All other options specified are passed directly to grep.  If no file is specified,  then  the
       standard input is decompressed if necessary and fed to grep.  Otherwise the given files are uncompressed if necessary and fed to grep.

       If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.

EXIT CODE

       2 - An option that is not supported was specified.

AUTHOR

       Charles Levert (charles@comm.polymtl.ca)

SEE ALSO

       grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)

																	  ZGREP(1)