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Full Discussion: [Perl] Strange ne "NO" behavior.
Top Forums Shell Programming and Scripting [Perl] Strange ne "NO" behavior. Post 302318755 by ejdv on Friday 22nd of May 2009 07:31:53 AM
Old 05-22-2009
[Perl] Strange ne "NO" behavior.
Hi there,

I have a strange problem and I cannot figure it out what I am doing wrong here.
Let me try to picture it.
In principle it is prety straight forward, but something odd is happening.

Here is part of the input file snmp_alm.cfg:

Code:
##############################################################
# Specifies if the PURGE Notification should be sent or Not  #
# Yes means the PURGE Notification is Not sent (disabled)    #
# No viceversa                                               #
# Default Value is: NO                                       #
##############################################################

DISABLE_PURGE_NOTIF:           	YES


Here is part of the Perl code:

Code:
my $disable_purge_notif;
my $disable_purge_notif_value;

open (SNMP_ALM_CFG, $snmp_alm_cfg) or die "Cannot open $snmp_alm_cfg";
while (<SNMP_ALM_CFG>) {
  s/#.*//;            # ignore comments by erasing them
  next if /^(\s)*$/;  # skip blank lines
  s/^[\s\t]+//;       # remove leading tabs and spaces
  s/[\s\t]+$//;       # remove trailing tabs and spaces
  s/://;              # remove :
  chomp;
	
  @_=split(/[\s\t]+/, $_, 2); # split on tabs on spaces

if (/DISABLE_PURGE_NOTIF/) {
  $disable_purge_notif = $_[0];
  $disable_purge_notif_value = $_[1];
  printf "Found parameter    : $disable_purge_notif\n";
  printf "Current setting is : $disable_purge_notif_value\n";
  if ( $disable_ack_notif_value ne "NO" ) {
    printf "ERROR - Correct $disable_purge_notif setting is : NO\n";
  }
}  
}
close (SNMP_ALM_CFG);


This is the output when the parameter value is YES:

Code:
Found parameter    : DISABLE_PURGE_NOTIF
Current setting is : YES
ERROR - Correct DISABLE_PURGE_NOTIF setting is : NO

So far so good.
But now I set it to NO:

Code:
DISABLE_PURGE_NOTIF:           	NO

Now I get the following output:

Code:
Found parameter    : DISABLE_PURGE_NOTIF
Current setting is : NO
ERROR - Correct DISABLE_PURGE_NOTIF setting is : NO


I thought "NO" ne "NO" would give 0 or false.
Using the debugger I see that $disable_ack_notif_value is indeed 'NO', so I am confused here.

Anything I overlooked ?
 

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LEARN ABOUT PHP

picture

Picture(3U)						    InterViews Reference Manual 					       Picture(3U)

NAME

       Picture - composite structured graphic

SYNOPSIS

       #include <Unidraw/Graphic/picture.h>

DESCRIPTION

       A  Picture defines a composition of graphic objects.  A picture has its own graphics state, which it concatenates with its children's state
       when it is drawn or erased.  Picture adopts the default concatenation semantics supported by the Graphic base class: The picture's graphics
       state  effectively  overrides  its  children's  so  that  they are drawn with the picture's state information substituted for their own.  A
       child's attribute is used only when the picture does not already define it.  Moreover, each child's transformer is  postmultiplied  by  the
       picture's transformer when the picture is drawn; thus children are drawn relative to the picture's coordinate system.

PUBLIC OPERATIONS

       Picture(Graphic* = nil)
	      Construct  a  new picture, optionally supply a graphic from which to copy an initial set of graphics state.  Picture is derived from
	      FullGraphic and therefore defines a full set of graphics state.

       virtual ~Picture()
	      The picture deletes its children when it is deleted.

       boolean IsEmpty()
	      Picture defines IsEmpty in addition to the standard Graphic child traversal operations to provide a convenient way to check  if  the
	      picture has any children.

PROTECTED OPERATIONS

       Graphic* graphic(UList*)
       UList* Elem(Iterator)
	      Convenience functions for extracting a graphic from a UList element and a UList from an iterator.

SEE ALSO

       Graphic(3U), Iterator(3U), Transformer(3I), UList(3U), pspaint(3U)

Unidraw 							  1 February 1991						       Picture(3U)
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