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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

fixnt

fixnt(1)							      Debian								  fixnt(1)

NAME

       fixnt - Filter for the Windows NT postscript printer driver.

SYNOPSIS

       fixnt < BADFILE.ps > GOODFILE.ps

DESCRIPTION

       The  Windows  NT  postscript  driver has a tendency to make broken postscript files, that are incompatible with psutils.  fixnt is a filter
       that fixes these problems, allowing the use of psnup(1).

       The filter takes the broken postscript file on stdin, and outputs a fixed postscript file on stdout.  It has no other form  for	invocation
       and takes no options on the command-line.

OPTIONS

       fixnt  takes no options.

BUGS

       fixnt does not check for NTPSOct94.  For a workaround, use a sed(1) command to replace 'NTPSOct94' with 'NTPSOct95', like so:
	      sed 's/NTPSOct94/NTPSOct95/g'
       This is particularly important for Windows NT 3.5 users.

AUTHOR

       fixnt   was   written   by   Holger   Bauer   <Holger.Bauer@topmail.de>,  Michael  Rath	<rath@itsm.uni-stuttgart.de>,  and  Akim  Demaille
       <demaille@inf.enst.fr>.

REPORTING BUGS

       Report bugs to the Authors, but avoid sending large postscript files.

       Patches are always welcome; send to <bauer@itsm.uni-stuttgart.de>.

SEE ALSO

       psnup(1), sed(1)

a2ps								   February 2003							  fixnt(1)
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