/usr/bin/optcvt is in tcvt 0.1.20171010-1.
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 10 11 12 13 14 15 | #!/bin/sh
TCVT="/usr/bin/tcvt"
MINWIDTH=80
SIZE=`stty size`
test $? = 0 || exit $?
COLUMNS="${SIZE#* }"
if test "$COLUMNS" -ge $((2*$MINWIDTH+1)); then
exec $TCVT "$@"
elif test -z "$@"; then
exec "$SHELL"
else
exec "$@"
fi
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