If that's all you need it for, I'd probably use the shorter, and more informative, file command (available on every Unix and Unix-like system that I've used in the last 40 years) rather than a Perl one-liner. 

$ file /usr/bin/perl
/usr/bin/perl: PE32+ executable (console) x86-64 (stripped to external
+ PDB), for MS Windows, 11 sections

$ file /usr/bin/perl > file_perl

$ file file_perl
file_perl: ASCII text

$ perle 'say -T "/usr/bin/perl" ? "text" : "binary"'
binary

$ perle 'say -T "file_perl" ? "text" : "binary"'
text

[download]

In case you haven't yet picked up on ++eyepopslikeamosquito's reference: 

$ alias perle
alias perle='perl -Mstrict -Mwarnings -Mautodie=:all -MCarp::Always -E
+'

[download]

— Ken

In reply to Re^2: How to use the -T file op as a one-liner by kcott
in thread How to use the -T file op as a one-liner by kwolcott

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