...
gzip_func() {
started=0
threads=4
for filename in `ls -1 ${EXP_DIR}/*.dmp`
do
 if [[ ${started} -lt ${threads} ]]; then
  let started=started+1
  echo "gzip ${filename}"
  ( $GZIPCMD ${filename} ) &
  list_of_pids="${list_of_pids} $!"
 else
  print "wait ${list_of_pids}"
  wait ${list_of_pids}
  list_of_pids=""
  started=0
 fi
done
}
...
my_binary_file_creation_process
...
while [ `find ${EXP_DIR} -name \*.dmp|wc -l` -gt "0" ]; do
 gzip_func
 print "wait ${list_of_pids}"
 wait ${list_of_pids}
 list_of_pids=""
done

gzip_func() {
started=0
threads=4
for filename in ${EXP_DIR}/*.dmp
do
 # Check if file is bigger than 8K and is not being used
 if [ `du -sk "${filename}"|awk '{print $1}'` -gt "8" ] && [ `fuser "${filename}" 2>/dev/null | wc -m` -eq "0" ]; then
   # Loop through files until 4 are started (to match threads)
   if [ ${started} -lt ${threads} ]; then
    started=$(( $started + 1 ))
    echo "gzip ${filename}"
    $GZIPCMD "${filename}" &
    list_of_pids="${list_of_pids} $!"
   else
    print "wait ${list_of_pids}"
    wait ${list_of_pids}
    list_of_pids=""
    started=0
   fi
 else
   echo "${filename} is still being written to, trying next file..."
 fi
done
}
 
# Export creation - note done in background to allow gzip loop to run
expdp '"/ as sysdba"' directory=DPUMP_DIR_ADHOC dumpfile=ram6_full%U.dmp logfile=ram6_full.log filesize=1024m full=y parallel=4 &
 
while [ `find ${EXP_DIR} -name \*.dmp|wc -l` -gt "0" ]; do
 gzip_func
 print "out of loop wait ${list_of_pids}"
 wait ${list_of_pids}
 list_of_pids=""
 sleep 5
done