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Full Discussion: Bash script too slow
Top Forums Shell Programming and Scripting Bash script too slow Post 302390890 by pludi on Friday 29th of January 2010 10:22:09 AM
Old 01-29-2010
OK here's what you can do:
  • use grep with -F as dpc.ucore.info suggested
  • use the -f file switch as described in the man page. That will allow you to load and search for multiple search strings at once
  • don't loop over 41 files, but specify them all at the command line at once. Use -H to display which file it was found in if needed.
With these, you could cut your search down to
Code:
grep -F -f WashFD.txt $( cat xfiles ) > SEID.searches

 

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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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