Questions tagged [special-variables]
25 questions
2
votes
1 answer
How to get a defined ${^OPEN}?
What changes are required in this code to get a defined ${^OPEN}?
#!/usr/bin/env perl
use warnings;
use strict;
use open qw( :std :utf8 );
print ${^OPEN};
Use of uninitialized value $^OPEN in print at ./perl.pl line 6.
sid_com
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1
vote
2 answers
The future of deprecated special variables
Are deprecated special variables (like $# and $*) lost forever or would it be possible the reuse them in a future Perl version?
sid_com
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1
vote
2 answers
Is it possible to "dump" all of the bash special variables via a command, like env?
#!/bin/bash
env
This spits out a bunch of environment variables. $0, $@, $_, etc. are not output. Is there a way to dump them out, similar to how env or set dumps the rest of the environment? I don't mean anything like echo $0 or something, I…
ND Geek
- 398
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1
vote
2 answers
How can I find position of matched regex of a single string in Perl?
Let's say my $string = "XXXXXTPXXXXTPXXXXTP";
If I want to match: $string =~ /TP/; multiple times and return the position for each, how would I do so?
I have tried$-[0], $-[1], $-[2] but I only get a position for $-[0].
EDIT:
I have also tried the…
Matt
- 13
- 2
1
vote
3 answers
Tracking of number of elements in an array iterated?
Is there any way that number of elements iterated in an for loop can be traced in perl:
Like using special variables:
@arrayElements = (2,3,4,5,6,7,67);
foreach (@arrayElements) {
# Do something
# Want to know how may elements been iterated…
Srivatsa Jenni
- 39
- 7
0
votes
0 answers
Why is the special variables class missing from my pycharm console?
Without this class, all the special variables are displayed, which is particularly messy!
I installed the same pycharm on the other computer, but did not experience the same problems.
0
votes
0 answers
Substitute variable inside another variable in bash
This is my sample bash code:
exec_command(){
command_1=""
command_2=""
command_3=""
now=$@
echo $now
}
for (( i=1; i<=3; i++ )); do
exec_command "command_$i"
Here the…
Muradin
- 3
- 4
0
votes
2 answers
Perl special variable "@_" in a subroutine not working
This script rips out the urls from a downloaded webpage. I had some trouble with this script - when I use the "my $csv_html_line = @_ ;"
and then print out the "@html_LineArray" - it just prints out "1's". When I replace the
"my $csv_html_line = @_…
capser
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0
votes
1 answer
In Perl the IRS ($/) is changed but it seems to scroll back the reading
I did a lot of searching on the scoping when using local.
I understand from here: http://www.perlmonks.org/?node_id=94007 that it changes temporarily the value of a variable in between when the "local" line is executed and when the next end of…
xor007
- 976
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-1
votes
2 answers
What do $/ and $\ do?
I've found $\ = $/ when I was investigating how to merge 2 arrays, but I don't understand this at all. An example with it:
use strict;
$\ = $/;
my @array1 = ("string1", "string2");
my @array2 = ("string3", "string4");
my @array = (@array1,…
xaxes
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