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Full Discussion: Remove spaces between file names
Top Forums Shell Programming and Scripting Remove spaces between file names Post 302301925 by bakunin on Sunday 29th of March 2009 09:08:40 AM
Old 03-29-2009
The problem with your code is that the shell uses whitespace to delimit words.

Suppose you have a file named "two words", and you write a command like "cp two words" - how is the shell supposed to know wether you want the file "two" copied to "words" or if you are talking about the file "two words" and the second argument is missing?

The same is true for the for-loop, which passes one argument at a time to the content of the loop - and "one argument" is "one word", because this is where the stream the for-loop works on was split at.

So, here is a script which relies on exactly this mechanism:

Code:
#!/usr/bin/ksh

typeset oldfile=""
typeset newfile=""

# the grep filters for filenames with spaces only:
ls -1 | grep "[^ ] [^ ]" | while read oldfile ; do
     newfile="$( print - $oldfile | tr -d ' ')"
     print - "mv \"${oldfile}\" \"${newfile}\"" # just display, next line is working
     # mv "$oldfile" "$newfile"
done

By the way: do not use for-loops to process lists of unknown length, like a directory listing. If the list grows too long it will exceed your maximum line length (see syslimits.h) and your code will break. Using a while-loop removes this risk.

I hope this helps.

bakunin
 

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LEARN ABOUT DEBIAN

astro::fits::header::gsd

Astro::FITS::Header::GSD(3pm)				User Contributed Perl Documentation			     Astro::FITS::Header::GSD(3pm)

NAME

       Astro::FITS::Header::GSD - Manipulate FITS headers from GSD files

SYNOPSIS

	 use Astro::FITS::Header::GSD;

	 $hdr = new Astro::FITS::Header::GSD( Cards => @cards );
	 $hdr = new Astro::FITS::Header::GSD( gsdobj => $gsd );
	 $hdr = new Astro::FITS::Header::GSD( File => $file );

DESCRIPTION

       This module makes use of the Starlink GSD module to read from a GSD header.

       It stores information about a FITS header block in an object. Takes an hash as an argument, with either an array reference pointing to an
       array of FITS header cards, or a filename, or (alternatively) a GSD object.

METHODS

       configure
	   Reads a header from a GSD file.

	     $hdr->configure( Cards => @cards );
	     $hdr->configure( Items => @items );
	     $hdr->configure( gsdobj => $gsd );
	     $hdr->configure( File => $filename );

	   Accepts a GSD object or a filename. If both "gsdobj" and "File" keys exist, "gsdobj" key takes priority.

       writehdr
	   The GSD library is read-only. The writehdr method is not implemented for this sub-class.

NOTES

       This module requires the Starlink GSD module.

       GSD supports keys that are longer than the 8 characters allowed as part of the FITS standard. GSD keys are truncated to 8 characters by
       this module.

SEE ALSO

       NDF, Astro::FITS::Header, Astro::FITS::Header::Item Astro::FITS::Header::CFITSIO, Astro::FITS::Header::NDF

AUTHORS

       Tim Jenness <t.jenness@jach.hawaii.edu>, Alasdair Allan <aa@astro.ex.ac.uk>

COPYRIGHT

       Copyright (C) 2008-2011 Science & Technology Facilities Council.  Copyright (C) 2001-2002 Particle Physics and Astronomy Research Council.
       All Rights Reserved.

       This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
       the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

       This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty of
       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation,
       Inc., 59 Temple Place,Suite 330, Boston, MA  02111-1307, USA

perl v5.14.2							    2012-06-30					     Astro::FITS::Header::GSD(3pm)
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