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Full Discussion: Search first line of compressed file
Top Forums UNIX for Advanced & Expert Users Search first line of compressed file Post 302135051 by cbreiner on Wednesday 5th of September 2007 02:04:15 PM
Old 09-05-2007
Search first line of compressed file
I want to read a directory full of compressed files and move the file to another directory if it meets certain criteria. I only want to look at the first line of the compressed file and if I find the string, do the move. I am currently using the following:

zgrep -R -L IH120070731/psoft/bnydata/etl/BNY_CRDW_UAT/source_archive/08012007 | xargs -i {} mv {} ../20070731/{}

This does fine and doesn't run too bad if most of the files will be moved. It takes forever for the zgrep to go through every line of every file when I really only want to check the first line.

Any ideas on how to limit the search to the first line only?

Thanks in advance.
 

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LEARN ABOUT X11R4

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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