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Full Discussion: Issue when using egrep to extract strings (too many strings)
Top Forums UNIX for Dummies Questions & Answers Issue when using egrep to extract strings (too many strings) Post 302971486 by Scrutinizer on Wednesday 20th of April 2016 06:34:24 PM
Old 04-20-2016
You could try putting those strings in a file, like so:

Code:
ILMN_2258774
ILMN_1700477
...
ILMN_1805992

Then you can extract like so:
Code:
grep -f stringfile test1>test2

For accuracy it would be better to use anchoring, by using a single space after each of the strings (ILMN_ is unique enough so the does not need to be a ^ in front) , to avoid possible false positives because of substring matches, unless all strings have the same length:

Code:
ILMN_2258774 
ILMN_1700477 
...
ILMN_1805992

--
On Solaris use /usr/xpg4/bin/grep
Last edited by Scrutinizer; 04-20-2016 at 08:23 PM..
This User Gave Thanks to Scrutinizer For This Post:
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LEARN ABOUT XFREE86

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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