CODEWITHSUNDEEP
bashpid
101001
101001

Reputation: 111

Start and Stop a process to find PID in Bash Script

I am given a program that runs until it is stopped using ctrl + c. I need to find the pid of this process and then output information like user time, system time, and total time using a bash script. It is my understanding that in order to do this I need to run the process and then stop it inside the script and after I stop the program I am able to find the information. I am having issues with stopping the process inside the script.

#!/bin/bash   

clarg="$1"

if [ "$clarg" == "cpu" ] ; then
    gcc -o cpu cpu.c
    ./cpu

   #This is where I'm lost and tried this out from  online but 
   #didn't work for me

   trap "exit" INT
   while :
   do
        sl -e
   done

#Commands to find PID info below.

Upvotes: 2

Views: 397

Answers (1)

Fonic
Fonic

Reputation: 2955

Based on your description, this should do what you want (explanation added as comments inside code):

#!/bin/bash

clarg="$1"

if [ "$clarg" == "cpu" ] ; then
    gcc -o cpu cpu.c

    # Run cpu via time in background, get pid of time process
    time ./cpu &
    ppid=$!

    # Let cpu run for a while
    sleep 15s
    # Alternatively, wait for user to hit ENTER
    #read -s -p "Hit ENTER to terminate cpu."

    # Get pid of time's child process (i.e. pid of cpu process) and stop
    # it by sending SIGINT (CTRL+C); time will exit and print its results
    cpid=$(pgrep -P $ppid)
    kill -INT $cpid
fi

I assumed here that cpu is the program you mentioned.

Upvotes: 1

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