Can one set perlvars on command line?

[J Krugman]

Is there any trick to set a Perl variable (or any global variable,
for that matter) on the command line, as in, for example:

% perl {{{set $| to 1}}} somescript.pl --opt --flag arg

so that myscript.pl started out with $| having value 1?

TIA,

jill

 

[gnari]

Is there any trick to set a Perl variable (or any global variable,
for that matter) on the command line, as in, for example:

% perl {{{set $| to 1}}} somescript.pl --opt --flag arg

so that myscript.pl started out with $| having value 1?

is it cheating to use
perl -Mcheat somescript.pl --opt --flag arg
where you have put cheat.pm somewhere in @INC ?

use of -Mmodule=arg,arg might help do this in a
general way:
perl -Msetvar=OUTPUT_AUTOFLUSH,1 somescript.pl


what about (untested):
perl -e'$|=1;require "somescript.pl"' --opt --flag arg


gnari

 

[Ben Morrow]

Is there any trick to set a Perl variable (or any global variable,
for that matter) on the command line, as in, for example:

% perl {{{set $| to 1}}} somescript.pl --opt --flag arg

so that myscript.pl started out with $| having value 1?

perl -e'$| = 1; do shift' somescript.pl --opt --flag arg
perl -Mvars::i='$|,1' somescript.pl --opt --flag arg

(These both assume sh-like shells: with other shells you may have a much harder
time.)

Get vars::i from CPAN.

Ben

 

[Malcolm Dew-Jones]

J Krugman ([email protected]) wrote:


: Is there any trick to set a Perl variable (or any global variable,
: for that matter) on the command line, as in, for example:

: % perl {{{set $| to 1}}} somescript.pl --opt --flag arg

: so that myscript.pl started out with $| having value 1?


put your defaults in a .pm file (e.g. mystuff.pm) in the @INC path, and
then try

perl -Mmystuff

(I've never -M used for this, but can't see why it wouldn't work).

Certain command line switches (e.g. -0 ) work for a few variables.

 

[Jeff Schwab]

Is there any trick to set a Perl variable (or any global variable,
for that matter) on the command line, as in, for example:

% perl {{{set $| to 1}}} somescript.pl --opt --flag arg

so that myscript.pl started out with $| having value 1?

It's *definitely* cheating, but you could use the -i flag to set $^I...