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Perl script does not recognize paths which contains environment variables


Perl script does not recognize paths which contains environment variables

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Perl script does not recognize paths which contains environment variables
Tag : perl , By : Lucyberad
Date : November 25 2020, 07:22 PM

around this issue There is nothing in your code evaluating $dir for environment variables inside of it, so you'd need to add that. A very simplistic way could be done like this - using a regular expression to find the variables and then replacing them with their values in the %ENV hash.
$dir =~ s/\$([A-Z0-9_]*)/$ENV{$1}/g;

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how to source a shell script [environment variables] in perl script without forking a subshell?


Tag : perl , By : Kyle
Date : March 29 2020, 07:55 AM
it helps some times Child environments cannot change parent environments. Your best bet is to parse env.sh from inside the Perl code and set the variables in %ENV:
#!/usr/bin/perl

use strict;
use warnings;

sub source {
    my $name = shift;

    open my $fh, "<", $name
        or die "could not open $name: $!";

    while (<$fh>) {
        chomp;
        my ($k, $v) = split /=/, $_, 2;
        $v =~ s/^(['"])(.*)\1/$2/; #' fix highlighter
        $v =~ s/\$([a-zA-Z]\w*)/$ENV{$1}/g;
        $v =~ s/`(.*?)`/`$1`/ge; #dangerous
        $ENV{$k} = $v;
    }
}

source "env.sh";

for my $k (qw/foo bar baz quux/) {
    print "$k => $ENV{$k}\n";
}
foo=5
bar=10
baz="$foo$bar"
quux=`date +%Y%m%d`
foo => 5
bar => 10
baz => 510
quux => 20110726
#!/bin/bash

source env.sh

exec foo.real

How to check the perl environment variables used in the script before executing?


Tag : perl , By : KT.
Date : March 29 2020, 07:55 AM
should help you out Not sure what you're getting at, but you can put your code inside a BEGIN block to see what your environment variables are before any modules you use are loaded.
BEGIN {
    require Data::Dumper;
    print STDERR Data::Dumper::Dumper( \%ENV );
}

Using Bash environment variables from within a Perl script?


Tag : linux , By : pjkinney
Date : March 29 2020, 07:55 AM
I hope this helps . There are two queries here, on use of Bash variables and on running external commands.
There is the %ENV hash in Perl, with environment variables
perl -wE'say $ENV{PWD}'
use warnings;
use strict;
use Cwd qw(cwd);

my $cwd = cwd;

my $path = '/first/path';

symlink($path, "$cwd/second/path") or die "Can't make a symlink: $!";

Error while executing the perl script and not able to set the Environment Variables


Tag : sql , By : bikefixxer
Date : March 29 2020, 07:55 AM
will be helpful for those in need After setting the above export commands in the etc/profile and etc/bashrc and adding as an .sh file under etc/profile.d fixed the issue.

How can i acces shell environment variables in a Perl script


Tag : oracle , By : TheDave1022
Date : March 29 2020, 07:55 AM
it should still fix some issue What i have ,
print "exported variable=$ORACLE_SID";
my $dbh = DBI->connect('dbi:Oracle:host=oracle;sid=$ORACLE_SID;port=1521', 'books_admin/MyPassword', '',{ RaiseError => 1, AutoCommit => 0 })or die print ("could not connect! $DBI::errstr \n");
'dbi:Oracle:host=oracle;sid=$ORACLE_SID;port=1521'
"dbi:Oracle:host=oracle;sid=$ORACLE_SID;port=1521"
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