/usr/bin/chktri is in liwc 1.20-5.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #!/bin/sh
#
# chktri - check for trigraphs in C source code
#
# Lars Wirzenius
# $Id: chktri,v 1.1.1.1 1996/09/16 18:19:50 liw Exp $
grep "??[()<>!'-=/]" $*
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