PROG := rot135.sh
PROGDIR := ..

INFILE := in/tfile.txt
RTFILE := out/rfile.txt
CKFILE := out/cfile.txt

all: ${PROGDIR}/${PROG} 
	cat ${INFILE} | ${PROGDIR}/${PROG} > ${RTFILE}
	cat ${RTFILE} | ${PROGDIR}/${PROG} > ${CKFILE}
	if ( cmp -s ${INFILE} ${CKFILE} ); then \
	  echo "ok!" 1>&2 ; \
        else \
	  echo "** not an involution" 1>&2 ; \
	fi
	prdiff ${INFILE} ${CKFILE}