Plan 9 from Bell Labs’s /usr/web/sources/contrib/gabidiaz/root/sys/src/cmd/perl/t/run/switchx.t
#!./perl BEGIN { chdir 't' if -d 't'; @INC = '../lib'; } require './test.pl'; use File::Spec::Functions; print runperl( switches => ['-x'], progfile => catfile(curdir(), 'run', 'switchx.aux') );