Re: A UNIX Query..

[Himadri Hazarika <himadrih@xxxxxxxxxxxx>]

man zgrep

HTH
Nitin

Himadri Hazarika wrote:

> > I've got a problem for all UNIX users.
> >
> > ------  The problem -----
> >
> > We are using unix compression utilities
> > 'compress' and 'gzip' to archive the CDRs (Call data records). While

> > searching the archive, we use
> > 'ZCat' and 'grep'.
> >
> > The problem comes here: For the projected data volumes, the system
must
> > support
> > a read and write per day of app. 13 terabytes. In order to reduce
this
> > figure,
> > we are looking at some solution for searching through a compressed
file
> > without
> > uncompressing it. (Though ZCat does this without uncompressing to a
file
> >
> > explicitly, it actually uncompresses and redirects to standard
output.)
> >
> > Please could you give me more information on the following:
> >
> >    Is it possible to search for a pattern/string through a
compressed
> > file
> >    without uncompressing it?
> >    If yes, is there any utility that supports this (for Unix)?
> >    If it is not possible to search without uncompressing, is there
any
> > other way
> >    of reducing the reads/writes to the primary hard disk system?
> > ----------------------------------------------------------------
> > Thanks
> >
> > - Himadri

Thanks Nitin,

zgrep still creates a temporary output file as its a combo of zcat and
grep i think. Is there some way around. Someone suggested modifying the
zcat code. Or else I guess the 13Tera file will have to be split into
manageable chunks which don't load the primary HD and then zgrep'ed.


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