#
#   looping script
#

#
# beginning -- this just copies the first file line-by-line into the target
# file
#
cat asn5a1.dat | awk '{tval=$1; aval=$2; print tval,aval;} END {print tval > "tval.dat"}' > asn5a_loop.dat

#
# middle section -- repeat this line as often as needed
#
export TVAL=`cat tval.dat`
cat asn5a2.dat | awk --assign tval=$TVAL 'BEGIN {tinc= 1/44100;} {tval += tinc; aval=$2; print tval,aval;} END {print tval > "tval.dat"}' \
 >> asn5a_loop.dat

#
# end section
#
export TVAL=`cat tval.dat`
cat asn5a3.dat | awk --assign tval=$TVAL 'BEGIN {tinc= 1/44100;} {tval += tinc; aval=$2; print tval,aval;} END {print tval > "tval.dat"}' >> asn5a_loop.dat