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Full Discussion: hard drive specs?
Operating Systems Linux hard drive specs? Post 49590 by TioTony on Tuesday 6th of April 2004 12:02:49 AM
Old 04-06-2004
It just takes time to learn all this. I have a degree in computer science and have been working with Unix and Linux for about 10 years. My best advice is read a lot and play with any hardware and OSes you can get your hands on. The cool thing about Linux and Unix is there is always more to learn. It's pretty much infinite for all practical purposes. Even guys like Perdarabo probably still learn new things pretty frequently. I can only hope to learn as much as he already knows.

For the tar command:

tar cf - /FTPFiles/*. This part creates a tar of all the files tar are in /FTPFiles. The "-" after the cf part just redirects the contents of the tar file to STDOUT instead of to a file. This is where the pipe comes in.

The | takes the STDOUT and redirects it to the next set of commands as STDIN. The () make these work as 1 unit. First we cd to /disk2/ftpfiles then is "untars" the data passed via -. The tar xf - uses "-" the same as the tar cf did. It opens what was STDOUT and has been changed to STDIN by the | to expand the archive. Basically you are using - as a file to pass info without actually creating a file on disk.

Your error may be caused if /FTPFiles doesn't have any files in it yet.
 

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PTARGREP(1)						 Perl Programmers Reference Guide					       PTARGREP(1)

NAME
ptargrep - Apply pattern matching to the contents of files in a tar archive SYNOPSIS
ptargrep [options] <pattern> <tar file> ... Options: --basename|-b ignore directory paths from archive --ignore-case|-i do case-insensitive pattern matching --list-only|-l list matching filenames rather than extracting matches --verbose|-v write debugging message to STDERR --help|-? detailed help message DESCRIPTION
This utility allows you to apply pattern matching to the contents of files contained in a tar archive. You might use this to identify all files in an archive which contain lines matching the specified pattern and either print out the pathnames or extract the files. The pattern will be used as a Perl regular expression (as opposed to a simple grep regex). Multiple tar archive filenames can be specified - they will each be processed in turn. OPTIONS
--basename (alias -b) When matching files are extracted, ignore the directory path from the archive and write to the current directory using the basename of the file from the archive. Beware: if two matching files in the archive have the same basename, the second file extracted will overwrite the first. --ignore-case (alias -i) Make pattern matching case-insensitive. --list-only (alias -l) Print the pathname of each matching file from the archive to STDOUT. Without this option, the default behaviour is to extract each matching file. --verbose (alias -v) Log debugging info to STDERR. --help (alias -?) Display this documentation. COPYRIGHT
Copyright 2010 Grant McLean <grantm@cpan.org> This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.18.2 2018-08-17 PTARGREP(1)
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