There is an error when i am trying to use the shift command in this way:
($1 = -d, $2 = 123, $3 = -c etc etc)
for $arg in $@
do
case $arg in
"-d") shift; (so that the $2 will become the $arg now)
(and while it loop the 2nd time,)
... (1 Reply)
Hi Folks,
In shell scripting the maximum no. of command line parameters becomes 9(Am i right). If we want to get more than 9 parameters we use the shift command.
Even here there are two possibilities.
1. Without the use of variables - The arguments are lost and the lost no. is equal to the... (6 Replies)
I am running a program where in I have this command
which is giving error the shift: number is not correct.
can you please tell me how shift actually works?
the line which is giving error is-
set $PARAM; shift; shift; shift; shift; shift; shift; shift; shift
Is it related somewhere to... (2 Replies)
hi,
another perl question,
I don't understand the below
while (<FILE>) {
push @last5, $_; #add to the end
shift @last5 if @last5 > 5 ; #take from the beginning
}
can someone please explain to me how does
shift @last5 if @last5 > 5 is taking last 5 lines from... (5 Replies)
Hi,
I wrote one script, in between script needs to use 10th and 11th positional parameters, that time i used "shift". Here i am facing the below find problem,
./DataCount.sh: cannot shift
I tried
1) I have read man pages for shift
2) Before but * and **
3) Simple shift with out giving... (4 Replies)
Hey all, I need some assistance. I'm writing a script to eject tapes from a tape library, but the library is not a queued system and can only eject 15 tapes at a time.
I added paste -d : -s so that it goes through full_tapes and puts each media_id on one line separated by the :.
Now I'm... (2 Replies)
Hi,
Firstly, I did a search for this question both on this site and on the internet and have not been able to find a suitable answer that is not general in nature.
I have always been a Windows user. I use my girl friend's mac every now and then, but I always come back to windows. For a... (1 Reply)
Hello Expert
Can any one please explain what is the use of shift command in general terms:
set -- $(ls -t)
shift
rm -Rf $*
what is the use of shift command over here.
Thanks a lot for your help (2 Replies)
Hello everyone,
I am new to Perl and I am having some issues getting a script to work. I have to create a script that uses an array of 52 cards, "shuffles" the cards (using loops with the pop, shift, and push commands), and prints out the top five. This is not a randomizing of the array just a... (2 Replies)
#!/bin/bash
hostname=$1; shift
for hostname in $1
do
ping $hostname
done
I want to run the above script as hostname.sh yahoo.com google.com cnn.com. I want to shift each hostname to $1. How can do that with above code as currently it's not shifting. (5 Replies)
Discussion started by: scj2012
5 Replies
LEARN ABOUT DEBIAN
hash::withdefaults
Hash::WithDefaults(3pm) User Contributed Perl Documentation Hash::WithDefaults(3pm)NAME
Hash::WithDefaults - class for hashes with key-casing requirements supporting defaults
version 0.05
SYNOPSIS
use Hash::WithDefaults;
%main = ( ... );
tie %h1, 'Hash::WithDefaults', {...};
tied(%h1)->AddDefault(\%main);
tie %h2, 'Hash::WithDefaults', [...];
tied(%h2)->AddDefault(\%main);
# now if you use $h1{$key}, the value is looked up first
# in %h1, then in %main.
DESCRIPTION
This module implements hashes that support "defaults". That is you may specify several more hashes in which the data will be looked up in
case it is not found in the current hash.
Object creation
tie %hash, 'Hash::WithDefault', [$case_option], [\%values];
tie %hash, 'Hash::WithDefault', [$case_option], [@values];
tie %hash, 'Hash::WithDefault', [$case_option], [%values];
The optional $case_option may be one of these values:
Sensitive - the hash will be case sensitive
Tolower - the hash will be case sensitive, all keys are made lowercase
Toupper - the hash will be case sensitive, all keys are made uppercase
Preserve - the hash will be case insensitive, the case is preserved
Lower - the hash will be case insensitive, all keys are made lowercase
Upper - the hash will be case insensitive, all keys are made uppercase
If you pass a hash or array reference or an even list of keys and values to the tie() function, those keys and values will be COPIED to the
resulting magical hash!
After you tie() the hash, you use it just like any other hash.
Functions
AddDefault
tied(%hash)->AddDefault(\%defaults);
This instructs the object to include the %defaults in the search for values. After this the value will be looked up first in %hash itself
and then in %defaults.
You may keep modifying the %defaults and your changes WILL be visible through %hash!
You may add as many defaults to one Hash::WithDefaults object as you like, they will be searched in the order you add them.
If you delete a key from the tied hash, it's only deleted from the list of specific keys, the defaults are never modified through the tied
hash. This means that you may get a default value for a key after you deletethe key from the tied hash!
GetDefaults
$defaults = tied(%hash)->GetDefaults();
push @$defaults, \%another_default;
Returns a reference to the array that stores the defaults. You may delete or insert hash references into the array, but make sure you
NEVER EVER insert anything else than a hash reference into the array!
Config::IniHash example
use Config::IniHash;
$config = ReadIni $inifile, withdefaults => 1, case => 'preserve';
if (exists $config->{':default'}) {
my $default = $config->{':default'};
foreach my $section (keys %$config) {
next if $section =~ /^:/;
tied(%{$config->{$section}})->AddDefault($default)
}
}
And now all normal sections will get the default values from [:default] section ;-)
AUTHOR
Jan Krynicky <Jenda@Krynicky.cz> http://Jenda.Krynicky.cz
COPYRIGHT
Copyright (c) 2002-2009 Jan Krynicky <Jenda@Krynicky.cz>. All rights reserved.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
perl v5.14.2 2012-05-26 Hash::WithDefaults(3pm)