Shell Programming and Scripting

 echo "filename.${PDY}${CYC}"               >>CONTROL

 ${PDY}

 # meteorology directory for today
  DAT="/directory/"
  YR=`echo ${PDY} | cut -c3-4`
  MO=`echo ${PDY} | cut -c5-6`
  DA=`echo ${PDY} | cut -c7-8`

# check for availability of current forecast
  if [ -f ${DAT}file1.${PDY-1}${CC} ]; then
     CYC=${CC}
  else
     CYC=${PC}
  fi

# create the first part of the control file
  echo "${YR} ${MO} ${DA} ${CYC}"            >CONTROL 
  echo "2"                                  >>CONTROL
  echo "${DAT}"                             >>CONTROL
  echo "file1.${PDY-1}${CYC}"               >>CONTROL
echo "${DAT}"                             >>CONTROL
  echo "file1.${PDY}${CYC}"               >>CONTROL
echo "${DAT}"                             >>CONTROL
  echo "file1.${PDY+1}${CYC}"               >>CONTROL
  
# append the second part of the control file
  cat ${FIXuser}/special_control            >>CONTROL