bash - Execute simultaneous commands and quit when one finishes -

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i hope question hasn't been asked many times couldn't find answer on google (i didn't know how specify it).

does know how execute 2 parallel commands in bash but, when 1 finishes, other finish?

for instance, have 2 different python scripts :

  • while 1: pass: loop.py
  • print(42): print.py

i python3 loop.py ** python3 print.py. 2 scripts must run in parallel , when print finishes, loop end automatically.

my usage of command make like: 

tcpdump -i -w out.trace ** python3 network_script.py

thank in advance

what want is

tcpdump ... & pid=$! python3 network_script.py kill $pid

run first script in background, start second script. when second script ends, kill first one.


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