Use the %ENV hash to access environment variables. Environment variables will not normally become Perl variables (unless you write some code to do so) magically. But note that, because perl is executed as a process, you cannot change the corresponding environment variable in the shell from Perl, because what you will get from Perl is just a copy:
I hope I am posting this in the right section.
I have c file that is using the motif GUI toolkit to draw widgets and things of that sort. I also have another program that runs with xnest. I need to figure out a way to place that xnest program in my c code so that it exists in the window that the... (4 Replies)
Hi Guys,
could someone tell me what this ksh construct does
typeset -r PROG_PWD=${0%/*} does
I understand the -r for readonly but I would very much appreciate a definitive account of what this will set $PROG_PWD to.
If I run this at the cmd line it it gets set to /usr/bin but I would... (2 Replies)
Hi
I am trying to run a script centrally that will go out and set the network management ip address on all my Sun boxes running Solaris. We have decided that the network management address will be the boxes main IP address but the first octet as a 172 rather than a 10, so for example ifconfig -a... (2 Replies)
Hello.
I found a Unix script on this site that calculates a date that is 2 months earlier from today. I'm using that script and writing the value to a file called 2monthsago.txt. I want to use that value in another script. Below is my attempt at doing that and the results.
My Script:
... (1 Reply)
I am trying to use one global declaration --> "exec 2>$ERR" to capture all stderr outputs that may occur anywhere in my script.
Then close it at the end of the script using --> "exec 2<&-"
I am using KSH on Solaris 8.
KSH Version M-11/16/88i
If I comment two "exec .." statements in the... (11 Replies)
My webpage is hosted from perlscript(homepage.pl), i want to add piece of html code in the footer of the homepage. I simply pasted the html code at the end of the perl script as below...
========================================================
close(OUTSQL);
... (4 Replies)
Hi,
I am working on a parsing script but cannot figure out how to accomplish this. Here is a simplified version of the script:
#!/bin/bash
DS=$1
DS=`expr $DS \* 2`
DS=`expr $DS + 7`
cat $FILENAME | awk '/<row><v> +/' | awk '{printf("%.0f %.0f\n", $6, $9)}'
The problem is that I want the... (2 Replies)
Hi
Its been a long time since I worked with ssh keys containing embedded shell commands and cannot remember how it is done.
Does anyone know of any sites that have a good tutorial on the subject? I'm not having much luck searching Google for it.
Incidentally, searching this forum for the... (6 Replies)
Hi All,
I am aware that html tags can be embedded in cgi script as below.. In the same way is it possible to embed the below javascript in perl cgi script ??
print("<form action="action.htm" method="post" onSubmit="return submitForm(this.Submitbutton)">");
print("<input type = "text"... (1 Reply)
Ive been trying to move to Perl. It has been a struggle.
My question is, is there a good resource that explains nesting statements.
As an example.
To change
primary
Factory CTS 1.9.0(46) P1
*Slot 1 CTS 1.10.2(42) P1
To
primary *Slot 1 CTS 1.10.2(42) P1
... (5 Replies)
Discussion started by: popeye
5 Replies
LEARN ABOUT MOJAVE
env
Env(3pm) Perl Programmers Reference Guide Env(3pm)NAME
Env - perl module that imports environment variables as scalars or arrays
SYNOPSIS
use Env;
use Env qw(PATH HOME TERM);
use Env qw($SHELL @LD_LIBRARY_PATH);
DESCRIPTION
Perl maintains environment variables in a special hash named %ENV. For when this access method is inconvenient, the Perl module "Env"
allows environment variables to be treated as scalar or array variables.
The "Env::import()" function ties environment variables with suitable names to global Perl variables with the same names. By default it
ties all existing environment variables ("keys %ENV") to scalars. If the "import" function receives arguments, it takes them to be a list
of variables to tie; it's okay if they don't yet exist. The scalar type prefix '$' is inferred for any element of this list not prefixed by
'$' or '@'. Arrays are implemented in terms of "split" and "join", using $Config::Config{path_sep} as the delimiter.
After an environment variable is tied, merely use it like a normal variable. You may access its value
@path = split(/:/, $PATH);
print join("
", @LD_LIBRARY_PATH), "
";
or modify it
$PATH .= ":.";
push @LD_LIBRARY_PATH, $dir;
however you'd like. Bear in mind, however, that each access to a tied array variable requires splitting the environment variable's string
anew.
The code:
use Env qw(@PATH);
push @PATH, '.';
is equivalent to:
use Env qw(PATH);
$PATH .= ":.";
except that if $ENV{PATH} started out empty, the second approach leaves it with the (odd) value "":."", but the first approach leaves it
with ""."".
To remove a tied environment variable from the environment, assign it the undefined value
undef $PATH;
undef @LD_LIBRARY_PATH;
LIMITATIONS
On VMS systems, arrays tied to environment variables are read-only. Attempting to change anything will cause a warning.
AUTHOR
Chip Salzenberg <chip@fin.uucp> and Gregor N. Purdy <gregor@focusresearch.com>
perl v5.18.2 2013-11-04 Env(3pm)