/usr/lib/fastdnaml/bin/transition is in fastdnaml 1.2.2-12.
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 9 | #! /bin/sh
#
# transition shell script
#
if test $# -ne 1; then echo "Usage: $0 transitions/transversions"; exit; fi
read first_line
echo "$first_line T"
echo "T $1"
cat -
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