Hi,
I'd like to know why you asked that. Did you run against a problem for "too many variables"? If so it could depends on your system imposing a limit on either the length of a line (see the update in liz answer) or some limit in the size of the parameter list for subs in the implementation of perl.

Remember that

use vars qw($foo @bar %foobar);
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is (almost) equivalent to

require vars;
vars->import('$foo','@bar','%foobar');
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While this implies that a limit on the size of the parameter list (or the memory space occupied bu such a list) would impact on the 'number of variables that could be used in a use vars statement', this also implies that, should the problem arise, you could split your use vars like:

use vars '$foo';
use vars '@bar';
use vars '%foobar';
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as require does not reload an already loaded module, but import is still called each time.

Hoping this helps.

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Leo TheHobbit