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Full Discussion: Problem in extracting vector data
Top Forums Shell Programming and Scripting Problem in extracting vector data Post 302176298 by era on Tuesday 18th of March 2008 03:20:07 AM
Old 03-18-2008
Please add some more hints. Is file B always a single line? Do you want to do this in the Enterprise Silver Platinum Mojo Beans way or just a one-off job?

Code:
sed -e 's/.*/s%^.*\\(<[^<>]*>\\).*%\\1 \* &%/' fileB | sed -f - fileA

In the famous words of Dennis M. Ritchie, You Are Not Supposed to Understand This.

Actually, as a brief overview, we are taking the contents of fileB (presumably a single line) and wrapping it inside some sed commands, which are then passed as a script to sed to run on fileA. Conveniently, the first sed writes a script for the second containing the contents of fileB and a bit of sed trickery. It's not even tricky at all, once you wrap your head around it (and decode the escapes needed to prevent the literal parts in the first script from being interpreted by the first sed).
Last edited by era; 03-18-2008 at 04:23 AM.. Reason: I forgot to add a plus on all lines but the first, but maybe that can be left as an exercise ...
era
 

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LEARN ABOUT DEBIAN

unrar-free

UNRAR-FREE(1)						      General Commands Manual						     UNRAR-FREE(1)

NAME

       unrar-free -- extract files from rar archives

SYNOPSIS

       unrar-free [-xtfp?V]  [--extract]  [--list]  [--force]  [--extract-newer]  [--extract-no-paths]	[--password]  [--help]	[--usage]  [--ver-
       sion] ARCHIVE  [FILE ...]	  [DESTINATION]

DESCRIPTION

       unrar-free is a program for extracting files from rar archives.

OPTIONS

       These programs follow the usual GNU command line syntax, with long options starting with  two  dashes  (`-').   A  summary  of  options	is
       included below.

       -x   --extract
		 Extract files from archive (default).

       -t   --list
		 List files in archive.

       -f   --force
		 Overwrite files when extracting.

       --extract-newer
		 Only extract newer files from the archive.

       --extract-no-paths
		 Don't create directories while extracting.

       -p   --password
		 Decrypt archive using a password.

       -?   --help
		 Show program help.

       --usage	 Show short program usage message.

       -V	    --version
		 Show version of program.

NON-FREE UNRAR COMPATIBLE SYNOPSIS
       unrar-free [elvx]  [-ep]  [-o+]	[-o-]  [-ppassword]  [-u]  [--] ARCHIVE  [FILE ...]	     [DESTINATION]

       This  syntax  should only be used in front-end programs which are using non-free unrar as a back-end. It is recommended to use this program
       by GNU command line syntax.

       e	 Extract files from archive without full path.

       l	 List files in archive.

       v	 Verbose list files in archive.

       x	 Extract files from archive with full path.

       -ep	 Don't create directories while extracting.

       -o+	 Overwrite files when extracting.

       -o-	 Don't overwrite files when extracting.

       -p	 Decrypt archive using a password.

       -u	 Only extract newer files from the archive.

       --	 Disable further switch processing. Any switch after the -- are treated as filenames and destination.

BUGS

       Advanced features of version 3.0 archives are not currently supported.

AUTHORS

       unrar-free was written by Ben Asselstine based on UniquE RAR File Library by Christian Scheurer and Johannes Winkelmann.

       This manual page was written by Niklas Vainio <niklas.vainio@iki.fi> for the Debian system (but may be  used  by  others).   Permission	is
       granted to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 2 any later version pub-
       lished by the Free Software Foundation.

       On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL.

																     UNRAR-FREE(1)
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