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RE (tilly) 3: Get default login environment

by tilly (Archbishop)
on Sep 22, 2000 at 21:37 UTC ( #33661=note: print w/replies, xml ) Need Help??

in reply to RE: RE (tilly) 1: Get default login environment
in thread Get default login environment

Actually...try this on for size:
sub get_login_env { local %ENV; my $shell = shift || (getpwuid($<))[8]; my $env = `echo env | perl -e 'exec {"$shell"} -sh'`; if (wantarray) { my @pieces = ($env =~ m/^(.*?)=((?:[^\n\\]|\\.|\\\n)*)/gm); s/\\(.)/$1/g foreach @pieces; return @pieces; } else { return $env; } }
Doesn't that take care of everything about how the env function encodes the environment? I tried putting = and returns into the name of environment variables and it wouldn't go...

I edited the RE slightly. I also should note that compared to the effort of launching a Perl process that execs itself into a login shell, a few invocations of the RE engine are unlikely to do much further damage...

UPDATE (Much later), Corion caught a silly missing | in the line that gets the environment. :-(

UPDATE 2 (Years later), as the discussion below points out, there was a silly syntax error. Fixed. Believe it or not, I used a version of this snippet for years, but that copy had been typed separately...

Replies are listed 'Best First'.
Re: RE (tilly) 3: Get default login environment
by Ronnie (Scribe) on Nov 18, 2004 at 10:43 UTC
    I downloaded this code but it doesn't work! When I try and use it the following error occurs -
    syntax error at line 8, near "m/^(.*?)=((?:[^\n\\]|\\.| +\\\n)*)/gm ;"
    The code to call this sub is also in a format that, novice that I am, I've not seen before -
    %ENV = (%ENV, get_bash_login_env());
    The ENV inside the brackets is throwing me. Is this the means by which the local (in the subroutine) %ENV is used to overwrite the existing %ENV? I've not seen this syntax before. Ronnie Cruickshank

      It was missing a closing bracket just before the ";" in that line. This works:

      sub get_login_env { local %ENV; my $shell = shift || (getpwuid($<))[8]; my $env = `echo env | perl -e 'exec {"$shell"} -sh'`; if (wantarray) { my @pieces = ($env =~ m/^(.*?)=((?:[^\n\\]|\\.|\\\n)*)/gm ); s/\\(.)/$1/g foreach @pieces; return @pieces; } else { return $env; } }

      Cheers, Sören

Re: RE (tilly) 3: Get default login environment
by Anonymous Monk on Oct 03, 2006 at 12:20 UTC
    Thanks, that's a great help. Bye, Ron.

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