Perl: import shell variable

Question

In shell, I had sourced .cshrc file which contains some defined variables like user name.

I need to pass these variables to a certain Perl script.

For example in shell terminal, I typed

>echo $user

The output is >esaad

Then in Perl, to read $user variable, I tried:

system("echo $user")

Also tried this command:

my $userName = system( echo $ENV{user} );

but Perl asked for $user initialization as Perl variable not Shell one.

How I could read this variable?

Are the variables environment variables or shell variables? If they are shell variables you won't be able to access them from Perl. — Diab Jerius
– Diab Jerius, Commented Jun 17, 2015 at 17:32

Community · Accepted Answer · 2017-05-23 11:51:20Z

4

You can:

print $ENV{'user'}

the reason your system call doesn't work is that system open a new shell that doesn't source .cshrc read this answer for more information

edited May 23, 2017 at 11:51

CommunityBot

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answered Jun 16, 2015 at 11:22

Alex G

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Comments

Lye Heng Foo · Accepted Answer · 2015-06-17 10:36:45Z

0

Either use Perl built-in system variable $ENV:

print $ENV{'user'}

Or use backslash to escape the variable $user. Perl will interpret for $user variable defined inside the Perl program without the backslash. With backslash, "echo $user" is passed as system call.

system("echo \$user")

answered Jun 17, 2015 at 10:36

Lye Heng Foo

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1 Comment

Diab Jerius Over a year ago

or, use single quotes: system('echo $user')

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