Linux Script to check if process is running and act on the result

by

Programs to monitor if a process on a system is running.

Script is stored in crontab and runs once every minute.

This works with if process is not running or process is running multiple times:

#! /bin/bash

case "$(pidof amadeus.x86 | wc -w)" in

0)  echo "Restarting Amadeus:     $(date)" >> /var/log/amadeus.txt
    /etc/amadeus/amadeus.x86 &
    ;;
1)  # all ok
    ;;
*)  echo "Removed double Amadeus: $(date)" >> /var/log/amadeus.txt
    kill $(pidof amadeus.x86 | awk '{print $1}')
    ;;
esac

0 If process is not found, restart it.
1 If process is found, all ok.
* If process running 2 or more, kill the last.

A simpler version. This just test if process is running, and if not restart it.

It just tests the exit flag $? from the pidof program. It will be 0 of process is running and 1 if not.

#!/bin/bash
pidof  amadeus.x86 >/dev/null
if [[ $? -ne 0 ]] ; then
        echo "Restarting Amadeus:     $(date)" >> /var/log/amadeus.txt
        /etc/amadeus/amadeus.x86 &
fi

And at last, a one liner

pidof amadeus.x86 >/dev/null ; [[ $? -ne 0 ]] && echo "Restarting Amadeus:     $(date)" >> /var/log/amadeus.txt && /etc/amadeus/amadeus.x86 &

This can then be used in crontab to run every minute like this:

* * * * * pidof amadeus.x86 >/dev/null ; [[ $? -ne 0 ]] && echo "Restarting Amadeus:     $(date)" >> /var/log/amadeus.txt && /etc/amadeus/amadeus.x86 &

cccam oscam

More Related Contents:

  1. How to ‘grep’ a continuous stream?
  2. Fastest way to find lines of a file from another larger file in Bash
  3. How to escape single quotes in Bash/Grep?
  4. How to concatenate multiple lines of output to one line?
  5. How to get the process ID to kill a nohup process?
  6. Linux/Unix command to determine if process is running?
  7. How do you search for files containing DOS line endings (CRLF) with grep on Linux?
  8. How to get the start time of a long-running Linux process?
  9. Start script after another one (already running) finishes
  10. Linux shell script to add leading zeros to file names
  11. create a file with prefix =file1 followed by the random number
  12. Linux grep command with relevant values as output
  13. Why to code a script which will check if some package is installed in linux and if not then install it?
  14. Read values into a shell variable from a pipe
  15. Use sudo with password as parameter [closed]
  16. Shell script: Run function from script over ssh
  17. What is the difference between using `sh` and `source`?
  18. Automating telnet session using bash scripts
  19. Run a shell command when a file is added
  20. How do I syntax check a Bash script without running it?
  21. how to get MouseMove and MouseClick in bash?
  22. Get last dirname/filename in a file path argument in Bash
  23. Bash script execution with and without shebang in Linux and BSD
  24. Variable in Bash Script that keeps it value from the last time running
  25. Exit code of variable assignment to command substitution in Bash
  26. How do I get cURL to not show the progress bar?
  27. Using `date` command to get previous, current and next month
  28. Linux: remove file extensions for multiple files
  29. Extract lines between two patterns from a file [duplicate]
  30. Why exit code 141 with grep -q?

Leave a Comment