Testing if "This::Package" is available (installed):
$ perl -MThis::Package -e 1
For example:
$ perl -MB::Deparse -e 1
$ perl -MThis::Package -e 1
Can't locate This/Package.pm in @INC (you may need to install the This
+::Package module) (@INC contains: /home/netbook/tmp/perl-5.24/lib/sit
+e_perl/5.24.1/i686-linux-thread-multi /home/netbook/tmp/perl-5.24/lib
+/site_perl/5.24.1 /home/netbook/tmp/perl-5.24/lib/5.24.1/i686-linux-t
+hread-multi /home/netbook/tmp/perl-5.24/lib/5.24.1 .).
BEGIN failed--compilation aborted.
Note: if installed, no output is shown.
Have fun!
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