Pure/tctical/suppress_tracing: new; can now switch tracing off until the
next tactical call. There is no good way of doing this because of
backtracking.
Pure/tctical/exec_trace_command,tracify,traced_tac: these set, test and
reset suppress_tracing
#! /bin/sh
# teeinput -- start a program and log all inputs to a file
# environment variable $LISTEN specifies the file name
tee -a -i $LISTEN | $*