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Full Discussion: How to sort a set of files by date in a directory?
Top Forums Shell Programming and Scripting How to sort a set of files by date in a directory? Post 302296948 by pludi on Thursday 12th of March 2009 07:44:55 AM
Old 03-12-2009
Code:
my @temp_array;
my @s;
my @sortedlist = map {  
                    @temp_array = split /\t/; 
                    $_ = $temp_array[1];}
                 sort 
                 map { @s = stat; $_ = "$s[9]\t$_"; }
                 @filelist;

print "@sortedlist\n";

Quote:
Originally Posted by alexf
now, I'm getting this error "Use of uninitialized value in concatenation (.) or string at perl_test2.pm line 20.", line 20 being the "map { @s = stat; $_ = "$s[9]\t$_"; }" statement. Looks like it's not liking $_, right ?
Nope. $_ is always initialized inside a map() (see perldoc -f map), as long as there are elements, and is always changeable since that's what it was originally intended for. I rather think that stat() can't find your file since it isn't in the current directory and you don't supply the complete path (see perldoc -f stat).
 

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LEARN ABOUT ULTRIX

ppmcolors

ppmcolors(1)						      General Commands Manual						      ppmcolors(1)

NAME

       ppmcolors - generate a color map of all colors of a certain maxval

SYNOPSIS

       ppmcolors [-maxval=maxval]

       All  options  can  be abbreviated to their shortest unique prefix.  You may use two hyphens instead of one to designate an option.  You may
       use either white space or an equals sign between an option name and its value.

DESCRIPTION

       ppmcolors generates a PPM color map containing all the colors representable with a certain maxval.

       A PPM color map is a regular PPM image that is used by some programs to define a set of colors.

       ppmcolors generates a one row PPM image that contains one pixel of each color representable by the maxval you choose.  The  maxval  of  the
       PPM  image  is  that maxval.  Note that you can change the maxval of the color map by running the output of ppmcolors through pnmdepth.	As
       long as the new maxval is a multiple of the original, the resulting set of colors will be identical.  If the new maxval is not a  multiple,
       the resulting set of colors will be slightly different.

       When you select a maxval of 5 (which is the default), you get a color map of the set of "web safe" colors as defined by Netscape.  Most web
       browsers guarantee that they can produce at least these 216 colors (215 plus black).

       pnmcolormap is another program to generate a color map.	It chooses a set of colors designed to represent the colors in a  specified  image
       (or simply the set of all the colors in that image, if you choose).

       pgmramp performs a similar function for PGM images.

OPTIONS

       -maxval=maxval
	      This is the maxval of the generated color map.  Default is 5.

SEE ALSO

       pnmdepth(1), pnmcolormap(1), ppmcie(1), ppmrainbow(1), pgmramp(1), ppm(5)

AUTHOR

       By Bryan Henderson, December 2001.

								 20 December 2001						      ppmcolors(1)
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