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Full Discussion: Perl Query
Top Forums Programming Perl Query Post 302766427 by durden_tyler on Monday 4th of February 2013 04:52:18 PM
Old 02-04-2013
Quote:
Originally Posted by gsiva
...
Same way, for the files under the directory is not getting the output properly.
Code:
$mode = sprintf "%04o", (stat '/etc/rc.d/[rc]*.d') [2] & 07777;
if($mode eq "0755")
{
print "GOOD: AD.1.8.18: The file /etc/rc.d/[rc]*.d exists and had permission 0755\n\n";
}
else
{
print "BAD: AD.1.8.18: The file /etc/rc.d/[rc]*.d exists and does not have permission 0755\n\n";
}
print `ls -ld /etc/rc.d/[rc]*.d`;
print "\n";

OUTPUT:

BAD: AD.1.8.18: The file /etc/rc.d/[rc]*.d exists and does not have permission 0755

drwxr-xr-x 2 root root 4096 Oct 24 15:55 /etc/rc.d/rc0.d
drwxr-xr-x 2 root root 4096 Oct 24 15:55 /etc/rc.d/rc1.d
drwxr-xr-x 2 root root 4096 Jan 14 13:24 /etc/rc.d/rc2.d
drwxr-xr-x 2 root root 4096 Jan 14 13:24 /etc/rc.d/rc3.d
drwxr-xr-x 2 root root 4096 Oct 24 15:55 /etc/rc.d/rc4.d
drwxr-xr-x 2 root root 4096 Jan 14 13:24 /etc/rc.d/rc5.d
drwxr-xr-x 2 root root 4096 Oct 24 15:55 /etc/rc.d/rc6.d

The output should be GOOD.
That's because Perl looks for a file that is literally called "/etc/rc.d/[rc]*.d", and since it could not find it, "stat" returns an empty array and the value of $mode is "0000".
Since that is not equal to "0755", the control goes to the "else" branch and the message you see is printed. Notice that despite the fact that the message says "... file exists...", you are not testing the existence of the file.
The output of "ls" is printed correctly because you pass the "ls" command to the shell, which expands the regular expression and lists all files that match it.

- Use the glob function of Perl to loop through all files of interest.
- Add the following two lines at the beginning of your program:

Code:
use strict;
use warnings;

The "use warnings" would've thrown a warning in your case, if it had been set.

tyler_durden
 

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LEARN ABOUT DEBIAN

ppmtosixel

ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME

       ppmtosixel - convert a portable pixmap into DEC sixel format

SYNOPSIS

       ppmtosixel [-raw] [-margin] [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as input.  Produces sixel commands (SIX) as output.	The output is formatted for color printing, e.g. for a DEC
       LJ250 color inkjet printer.

       If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled.  A printer control header and a color assignment table
       begin the SIX file.  Image data is written in a compressed format by default.  A printer control footer ends the image file.

OPTIONS

       -raw   If  specified,  each  pixel  will  be explicitly described in the image file.  If -raw is not specified, output will default to com-
	      pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands.  A raw file is often an order	of  magni-
	      tude larger than a compressed file and prints much slower.

       -margin
	      If  -margin  is not specified, the image will be start at the left margin (of the window, paper, or whatever).  If -margin is speci-
	      fied, a 1.5 inch left margin will offset the image.

PRINTING

       Generally, sixel files must reach the printer unfiltered.  Use the lpr -x option or cat filename > /dev/tty0?.

BUGS

       Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion.  If the original PPM maxval was
       greater	than  100,  rescaling  also reduces the image depth.  While the actual RGB values from the ppm file are more or less retained, the
       color palette of the LJ250 may not match the colors on your screen.  This seems to be a printer limitation.

SEE ALSO

       ppm(5)

AUTHOR

       Copyright (C) 1991 by Rick Vinci.

								   26 April 1991						     ppmtosixel(1)
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