Perl $ENV not accessing environment variable

Question

Here is a WSL bash session in which I attempt to access an Environment variable within a perl one liner:

$ ln='Hello World'
$ echo $ln
Hello World
$ perl -E 'say $ENV{q(ln)}'

$

Why does the perl expression $ENV{q(ln)} not contain the expected Environment variable ln ?

@Wes : Because it is just a shell variable, but not an environment variable. — user1934428, Apr 19 '21 at 09:17

score 2 · Accepted Answer · answered Apr 19 '21 at 04:23

2

You need to export the environment variable.

$ ln='Hello World'
$ export ln

or

$ export ln='Hello World'

See section 3.2.3 in the Bash Beginners' Guide, and the top answer to this stackoverflow question

answered Apr 19 '21 at 04:23

Jim Davis

1 Answers1