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Full Discussion: Extracting data from many compressed files
Top Forums UNIX for Dummies Questions & Answers Extracting data from many compressed files Post 302411831 by Boltzmann on Friday 9th of April 2010 01:55:55 PM
Old 04-09-2010
Quote:
Originally Posted by thegeek
Yes, z commands have power. You can do zgrep directly, instead of cat & grep.

Refer: The Power of Z Commands – Zcat, Zless, Zgrep, Zdiff Examples (link removed)


Thank you for the advice. I guess I don't have bzgrep installed. I tried using zgrep, but that is actually slower than bzcat piped to grep.

The latter is definitely much faster than my original loop, but still too slow.

I am quite new to all this, so sorry if I am sounding rather amateurish (I am indeed that).

In each of my files, the relevant lines are always the same ones - as a means of an example, say I want to extract lines 5, 17, 38, ... from each of the files. So supposing I can identify which the real line numbers are, would there be a better way to extract them than to use grep. It seems not very efficient to have grep search every file if in effect it is known exactly which lines are needed.

Thank you again and sorry if there is an obvious answer.
 

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LEARN ABOUT LINUX

zegrep

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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