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Full Discussion: Piping commands using xargs
Top Forums UNIX for Beginners Questions & Answers Piping commands using xargs Post 303008245 by RudiC on Wednesday 29th of November 2017 08:34:22 AM
Old 11-29-2017
I'm afraid there are more than one erroneous approaches in above:
- the files seem to be gzipped (by their ending) - gunzip before presenting them to tar. In fact, I'm slightly alienated that your single manual command should run error free...
- Shouldn't there be a message like tar: This does not look like a tar archive?
- the -f option takes just one single file (except for a multi-volume archive which I doubt you have here)

You might want to try the -n1 option to xargs and see how far you get.
 

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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 v5.14.2 2014-09-30 PTARGREP(1)
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