checking for a Process

reygudu · 11-18-2005, 04:14 AM

"Hello World"

i have a small question, and i don´t know if my solution is the best one.

may be somebody can help me...

i have to contruct a shell script to verify that a process runs all the time

My idea is to do a small program, called by cron each 5 min:

pidno=$( ps ax | awk '/process-name/ { print $1 }' )
if test "$pidno" ; then
echo "Process process-name is running"
else
echo "Process process-name not running"
echo "Executing the process again"
/home/user/process-name
fi

Someone knows a better idea????

Thanks a lot....

Ruben

Artanicus · 11-18-2005, 05:03 AM

Yours seems to be a pretty good implementation. Just a couple additions id suggest:

enter the process-name with one char in [] to avoid getting the awk process also in the listing.. Also echos upon a succesful run probably arnt a good idea when running via crontab.. You dont want to be mailed every time its running normally, but perhaps you want a notification when it wasnt running and was restarted..

So the modified code:

Code:

pidno=$(ps ax | awk '/proc[e]ss-name/ { print $1 }' )
if test "$pidno" ; then
exit 0
else
echo "Process process-name not running"
echo "Executing the process again"
/home/user/process-name
fi

reygudu · 11-20-2005, 07:22 AM

Hi Artanicus,

thanks for your Suggestion,

finally i used:

Code:

while true 
do
  pidno=$( ps ax | awk '/pro[c]cess-name/ { print $1 }' )
  if ! test "$pidno" ; then
    echo "Executing the process again"
    /home/user/process-name  
  fi
  sleep 300
done

best regards...

bigearsbilly · 11-21-2005, 04:13 AM

you can also use:

pgrep -l process-name

saves all that ps| grep nonsense.
there is also pkill