Run a script when a file is modified/time stamp changed

Shell Programming and Scripting
1

Hi,

I need to run a script file which uses a file and that file is modified as and when some alarms generated, it is not based on any fixed time period.. it may be modified even once in a minute for some time and once in 30 min or once in 20 min. Hence i need to watch for the timestamp change of this file and run some scripts to process that. Since the file is overwritten i have to follow this kind of process.

pls guide me..

---------- Post updated at 05:44 PM ---------- Previous update was at 05:35 PM ----------

Hope this may help

time=$(ls -l $1 | awk -F" "  '{ print $7 }')
while :
do
   chk_time=$(ls -l $1 | awk -F" "  '{ print $7 }')
   if [ "$chk_time" != "$time" ]
   then
      echo "File modified"
      mailx -s "File $1 modified"  abc.dfg@xxx.com
      break; # if you want to stop the script once mail is send
   fi
   sleep 5  # 5sec wait time
done
2

so what is it that you want?

regards,
Ahamed

3

Hi,

In a hurry i posted that requirement and searched immediately and got some clue...but i tried the following way i could not succeed.

#!/bin/bash
time=$(ls -l /home/dg/sm.ini | /usr/xpg4/bin/awk -F" "  '{ print $8 }')
timehr=$(echo $time | /usr/xpg4/bin/awk -F: '{print $1}')
timemin=$(echo $time | /usr/xpg4/bin/awk -F: '{print $2}')
while :
do
   chk_time=$(ls -l /home/dg/sm.ini | /usr/xpg4/bin/awk -F" "  '{ print $8 }')
   chk_timehr=$(echo $chk_time | /usr/xpg4/bin/awk -F: '{print $1}')
   chk_timemin=$(echo $chk_time | /usr/xpg4/bin/awk -F: '{print $2}')
if [ "$chk_timehr" != "$timehr" ] && [ "$chk_timemin" != "$timemin" ]
   then
     echo "/home/dg/SM/SMfile"
      sleep 5
      echo "/home/dg/SM/SMomAlarm"
   fi
   sleep 5  # 5sec wait time
done

pls help me

4

Try this

#!/bin/bash
while :
do
   chk_time=$(ls -l run | awk -F" "  '{ print $8 }')
   chk_timehr=$(echo $chk_time | awk -F: '{print $1}')
   chk_timemin=$(echo $chk_time | awk -F: '{print $2}')
   if [ "$chk_timehr" != "$timehr" ] || [ "$chk_timemin" != "$timemin" ]
   then
     time=$(ls -l run | awk -F" "  '{ print $8 }')
     timehr=$(echo $time | awk -F: '{print $1}')
     timemin=$(echo $time | awk -F: '{print $2}')
     echo "/home/dg/SM/SMfile"
     sleep 5
     echo "/home/dg/SM/SMomAlarm"
   fi
   sleep 5  # 5sec wait time
done

regards,
Ahamed