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Full Discussion: How to remove lines without a particular string in either column?
Operating Systems Linux How to remove lines without a particular string in either column? Post 302958099 by MadeInGermany on Monday 19th of October 2015 10:22:50 AM
Old 10-19-2015
With grep:
Code:
grep -v 'refseq:NP.*refseq:NP' file

Not asked here, but I want to mention that sed can delete the nth occurrence, here the 2nd:
Code:
sed 's/|refseq:NP[_0-9]*//2' file

---------- Post updated at 09:22 AM ---------- Previous update was at 08:55 AM ----------

Thanks to RavinderSingh, I see you want to do the opposite, then it's
Code:
grep 'refseq:NP.*refseq:NP' file

BTW you can use a back reference as follows
Code:
grep '\(refseq:NP\).*\1' file

This User Gave Thanks to MadeInGermany For This Post:
Syeda Sumayya
 

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LEARN ABOUT V7

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)
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