$ cat -vet test_input.txt
Albert apple /path/to/somewhere/a$
# next line is <TAB><TAB><NL>$
^I^I$
Jack pineapple /path/to/somewhere/b$
# next line is only space characters$
     $
Jack apple /path/to/somewhere/c$
# Comments only work when # is first character!$
Dex jackfruit /path/to/somewhere/d$
# next line is blank$
$