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Find linux process with bash

decentralizuj profile image decentralizuj ・2 min read

If you ever found yourself googling how to find active processes in linux, or process with the highest CPU, save this post as a reference, and save code into the script.

COMMANDS:

ps aux
#=> list processes

grep 'firefox'
#=> show firefox processes

awk *opts
#=> choose what we want to print
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We will use this simple commands, so let's make a script for this:

#!/usr/bin/env bash

#  Define 'help' banner
function print_help() {
  echo -e "--------------------------------------------------------------"
  echo -e " - procfind will print the highest CPU% processes"
  echo -e " - procfind firefox - will print firefox processes"
  echo -e "--------------------------------------------------------------"
}

  #  max number of processes to show
  processes="10"

  if [ "$1" == "-h" ] || [ "$1" == "--help" ]; then
    print_help
    exit

  else

    # If first argument is passed as string, search processes for that arg
    echo "CPU |PID |MEM |START |COMMAND"
    ps aux | grep "$1"| awk '{print $3,$2,$4,$9,$11}' | sort -rn | head -n "$processes"
  fi
  exit
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Save script as you want (procfind) and give it executable permissions with sudo chmod +x procfind. No .sh at the end because we defined our environment #!/usr/bin/env bash.

Now if we run ./procfind -h, we will get:

------------------------------------------------------------
 - ./procfind will print the highest CPU% processes
 - ./procfind firefox - will print firefox processes
------------------------------------------------------------
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If we run ./procfind firefox:

CPU |PID |MEM |START |COMMAND
20.2 24281 10.1 16:04 /home/USERNAME/PATH/tor-browser_en-USA/Browser/firefox.real
11.8 24209 12.5 16:03 ./firefox.real
1.9 24325 9.8 16:04 /home/USERNAME/PATH/tor-browser_en-USA/Browser/firefox.real
1.4 24361 5.2 16:04 /home/USERNAME/PATH/tor-browser_en-USA/Browser/firefox.real
0.7 31245 6.0 18:25 /home/USERNAME/PATH/tor-browser_en-USA/Browser/firefox.real
0.0 376 0.0 19:21 grep
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