Thread groups in bash?

Hi, in bash you can run two commands at the same time, using c1 & c2, but what if you want to run c3 only when c1 and c2 are finished?

Is that possible in bash or will it require a real programming language?

You could sleep it while testing any condition like exit code OK, exists PID, exists pidfile.

I see your point, but how do you test for such things in bash? Is there a command, that gives you exit code from a process number or such?

(c1 & c2) && c3

Originally Posted by merchtemeagle (c1 & c2) && c3

Sadly, if I run for excample (sleep 4 & echo hi & echo test) && echo end. Bash prints hi, test and end instantly. Not waiting for the sleep.

I've made a very simple pythonscript for the purpose:

import sys, os, time, threading
from threading import Thread

class commandThread(Thread):
    def __init__(self, command):
        self.command = command
        Thread.__init__(self)
    def run(self):
        os.system(self.command)

for command in sys.argv[1:]:
    thread = commandThread(command)
    thread.start()
    
while threading.activeCount() > 1:
    time.sleep(1)

You run it like

./scriptname.py "echo hi" "echo test"; echo end