Menu
How do I set an environment variable in Perl?
I want to set $HOME to a different directory than the default.
334
But in the specific case of an environment variable, you don't need the exists test anyway: environment variables are always strings, so they are never undef unless they haven't been set — making exists equivalent to defined for them. So you can just write if(defined $ENV{'VARIABLE_NAME'}) or if(defined $debug) .
6.3. For a module to export one or more identifiers into a caller's namespace, it must: use the Exporter module, which is part of the standard Perl distribution, declare the module to inherit Exporter's capabilities, by setting the variable @ISA (see Section 7.3. 1) to equal ('Exporter'), and.
Perl has three main variable types: scalars, arrays, and hashes. A scalar represents a single value: my $animal = "camel"; my $answer = 42; Scalar values can be strings, integers or floating point numbers, and Perl will automatically convert between them as required.
You can do it like this:
$ENV{HOME} = 'something different';
But please note that this will only have an effect within the rest of your script. When your script exits, the calling shell will not see any changes.
As perldoc -v %ENV says:
%ENVThe hash%ENVcontains your current environment. Setting a value in "ENV" changes the environment for any child processes you subsequently "fork()" off.
147
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
