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#!/usr/bin/perl

...
my $test_ls = `lxs`;

like( $test_ls, qr/incorrect/, 'lxs command is missing.' );

1..1
Can't exec "lxs": No such file or directory at ./1.t line 7.
...
#                   undef
#     doesn't match '(?-xism:incorrect)'
# Looks like you failed 1 test of 1.