First time so excuse my ignorance please.
I may not be accurately describing the issue.
I have inherited a small lab mostly SUN V120s.
We lost power and are trying to recover.
Nope no backups...
The primary issue I have is 1 box is an Oracle Server.
It has 2 36Gb harddrives.
I am able to... (3 Replies)
Hi,
I was trying to call "script <an ip add>" command from .profile file to log everything whenever anyone logs in to this user. I did the following at the end of .profile. 1) Extracted the IP address who logged in 2) Called script < ip add> . The problem I am facing is all, aliases etc. written... (3 Replies)
Discussion started by: amicon007
3 Replies
3. Post Here to Contact Site Administrators and Moderators
Hi,
yesterday I have got reply in my thread
how to redirect shell pipe to 2 pipes.
I would read that answer once again,
as my re.re. is also lost
Jack (6 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
I have just gotten into writing bash scripts for a class, part of the assignment is to read and be able to tell... (4 Replies)
Hi,
I want to do SSH on many different machines and then run some commands on them. A binary application randomly generates IP addresses and my script will take care of doing SSH.
$ ./IPGen.exe | ./myScript.sh
my script looks like this:
while read line; do
result1=$(ssh $line... (2 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
Hey whats up everyone,
Currently I'm stuck. In this question I have to use the following commands test, shift,... (7 Replies)
Hi,
I have a bash script to run many system commands on CentOS machine, but I am puzzled by some commands had no effect on parent environment.
For example, I want to refresh the desktop xdg menu when some processes added or deleted items from desktop xdg menu. If I run "killall gnome-panel"... (4 Replies)
Hi there,
im just having a hard time understanding why this code does not print anything that is suppose to print:
score = raw_input ('what is your score? \n')
try:
if 1.0 == float(score) >= 0.9:
print "A"
elif 0.9 > float(score) >= 0.8:
... (1 Reply)
Hi,
i want use this Comand for my psql request
sh ssh -o StrictHostKeyChecking=no rootatemailaddress.de sudo psql -U postgres -c "select pg_terminate_backend(pid) from pg_stat_activity where datnam=\'$DB\';"'"
but the shell lost the inverted comma for datnam=\'$DB\'. The request deliver... (2 Replies)
Discussion started by: peterpane007
2 Replies
LEARN ABOUT MOJAVE
boolean
boolean(3pm) User Contributed Perl Documentation boolean(3pm)NAME
boolean - Boolean support for Perl
SYNOPSIS
use boolean;
do &always if true;
do &never if false;
do &maybe if boolean($value)->isTrue;
and:
use boolean ':all';
$guess = int(rand(2)) % 2 ? true : false;
do &something if isTrue($guess);
do &something_else if isFalse($guess);
and:
use boolean -truth;
die unless ref(42 == 42) eq 'boolean';
die unless ("foo" =~ /bar/) eq '0';
DESCRIPTION
Most programming languages have a native "Boolean" data type. Perl does not.
Perl has a simple and well known Truth System. The following scalar values are false:
$false1 = undef;
$false2 = 0;
$false3 = 0.0;
$false4 = '';
$false5 = '0';
Every other scalar value is true.
This module provides basic Boolean support, by defining two special objects: "true" and "false".
RATIONALE
When sharing data between programming languages, it is important to support the same group of basic types. In Perlish programming
languages, these types include: Hash, Array, String, Number, Null and Boolean. Perl lacks native Boolean support.
Data interchange modules like YAML and JSON can now "use boolean" to encode/decode/roundtrip Boolean values.
FUNCTIONS
This module defines the following functions:
true
This function returns a scalar value which will evaluate to true. The value is a singleton object, meaning there is only one "true"
value in a Perl process at any time. You can check to see whether the value is the "true" object with the isTrue function described
below.
false
This function returns a scalar value which will evaluate to false. The value is a singleton object, meaning there is only one "false"
value in a Perl process at any time. You can check to see whether the value is the "false" object with the isFalse function described
below.
boolean($scalar)
Casts the scalar value to a boolean value. If $scalar is true, it returns "boolean::true", otherwise it returns "boolean::false".
isTrue($scalar)
Returns "boolean::true" if the scalar passed to it is the "boolean::true" object. Returns "boolean::false" otherwise.
isFalse($scalar)
Returns "boolean::true" if the scalar passed to it is the "boolean::false" object. Returns "boolean::false" otherwise.
isBoolean($scalar)
Returns "boolean::true" if the scalar passed to it is the "boolean::true" or "boolean::false" object. Returns "boolean::false"
otherwise.
METHODS
Since true and false return objects, you can call methods on them.
$boolean->isTrue
Same as isTrue($boolean).
$boolean->isFalse
Same as isFalse($boolean).
USE OPTIONS
By default this module exports the "true", "false" and "boolean" functions.
The module also defines these export tags:
:all
Exports "true", "false", "boolean", "isTrue", "isFalse", "isBoolean"
-truth
You can specify the "-truth" option to override truth operators to return "boolean" values.
use boolean -truth;
print ref("hello" eq "world"), "
";
Prints:
boolean
"-truth" can be used with the other import options.
AUTHOR
Ingy doet Net <ingy@cpan.org>
COPYRIGHT
Copyright (c) 2007, 2008, 2010, 2011. Ingy doet Net.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
See http://www.perl.com/perl/misc/Artistic.html
perl v5.12.4 2011-09-12 boolean(3pm)