Shell Programming and Scripting

for i in `cat ${TMP_TRG_FILE}`  -- where TMP_TRG_FILE contains trigger files trg1.txt trg2.txt trg3.txt
do

   if [ -e "$i" ]
   then
       echo "File Exists"
       break
   else
       sleep 10
   fi
 
done

file TMP_TRG_FILE contains following entries:

/tmp/wf_fact1_a_sessions_completed.trg
/tmp/wf_fact1_b_sessions_completed.trg
/tmp/wf_fact1_d_sessions_completed.trg
/tmp/wf_fact1_e_sessions_completed.trg
/tmp/wf_fact2_b_sessions_completed.trg
/tmp/wf_fact2_c_sessions_completed.trg

There exists only 4 trigger files and 2 missing in /tmp:
wf_fact1_a_sessions_completed.trg
wf_fact1_b_sessions_completed.trg
wf_fact1_d_sessions_completed.trg
wf_fact1_e_sessions_completed.trg

Here's the output results:
file: /tmp/wf_fact1_a_sessions_completed.trg
File Exists
file: /tmp/wf_fact1_b_sessions_completed.trg
File Exists
file: /tmp/wf_fact1_d_sessions_completed.trg
File Exists
file: /tmp/wf_fact1_e_sessions_completed.trg
File Exists
file: /tmp/wf_fact2_b_sessions_completed.trg
sleeping...
file: /tmp/wf_fact2_c_sessions_completed.trg
sleeping...
$

#!/bin/ksh
Err_Flag=1
until [ $Err_Flag -eq 0 ]
do
   Err_Flag=0
   for i in `cat ${TMP_TRG_FILE}`      # where TMP_TRG_FILE contains trigger files trg1.txt trg2.txt trg3.txt
   do
      if [ -e "$i" ]
      then
         >/dev/null                    # File Exists, do nothing
      else
         echo "Still waiting for $i"
         ((Err_Flag=$Err_Flag+1))      # Increment counter to show we're still waiting
      fi
   done
   echo "Waiting for $Err_Flag files."
   sleep 10
done

while read trigger_file
do
   while [[ ! -e $trigger_file ]]
   do
      print "Waiting for trigger file: $trigger_file"
      sleep 10
   done
done < $TMP_TRG_FILE

while [[ $(ls /tmp/wf_fact@(1_[abde]|2_[bc])_sessions_completed.trg | wc -l) -lt `cat ./TMP_TRG_FILE | wc -l` ]]
do
     sleep 10
done

while :
do
     MISSING=$(ls /tmp/wf_fact@(1_[abde]|2_[bc])_sessions_completed.trg | grep -vf - TMP_TRG_FILE)
     [[ -z $MISSING ]] && break
     echo "Following Trigger still missing : $MISSING"
     sleep 10
done