A deprecated form of subroutine call. See the perlsub manpage.
Uses the value of EXPR as a filename and executes the contents of the file as a Perl script. Its primary use is to include subroutines from a Perl subroutine library.
is just like
eval `cat stat.pl`;
except that it's more efficient, more concise, keeps track of the current
filename for error messages, and searches all the -I
libraries if the file isn't in the current directory (see also the
@INC array in Predefined Names). It's the same, however, in that it does re-parse the file every time you
call it, so you probably don't want to do this inside a loop.
Note that inclusion of library modules is better done with the
require operators, which also do error
checking and raise an exception if there's a problem.