CODEWITHSUNDEEP
bashsh
Van Teo Le
Van Teo Le

Reputation: 156

How to run 2 commands on bash concurrently

I want to test my server program,(let's call it A) i just made. So when A get executed by this command

$VALGRIND ./test/server_tests 2 >>./test/test.log

,it is blocked to listen for connection.After that, i want to connect to the server in A using

nc 127.0.0.1 1234 < ./test/server_file.txt

so A can be unblocked and continue. The problem is i have to manually type these commands in two different terminals, since both of them block. I have not figured out a way to automated this in a single shell script. Any help would be appreciated.

Upvotes: 0

Views: 956

Answers (2)

dash-o
dash-o

Reputation: 14432

From the question, it looks if the goal is to build a test script for the server, that will also capture memory check.

For the specific case of building a test script, it make sense to extend the referenced question in the comment, and add some commands to make it unlikely for the test script to hang. The script will cap the time for executing the client, executing the server, and if the test complete ahead of the time, it will attempt to shutdown the server.

   # Put the server to the background
(timeout 15 $VALGRIND ./test/server_tests 2 >>./test/test.log0 &
svc_pid=$!

   # run the test cilent
timeout 5 nc 127.0.0.1 1234 < ./test/server_file.txt
   .. Additional tests here

   # Terminate the server, if still running. May use other commands/signals, based on server.
kill -0 $svc_id && kill $svc_pid
wait $svc_pid

   # Check log file for error
   ...

Upvotes: 1

Rohan Talesara
Rohan Talesara

Reputation: 186

You can use & to run the process in the background and continue using the same shell.

$VALGRIND ./test/server_tests 2 >>./test/test.log &
nc 127.0.0.1 1234 < ./test/server_file.txt

If you want the server to continue running even after you close the terminal, you can use nohup:

nohup $VALGRIND ./test/server_tests 2 >>./test/test.log &
nc 127.0.0.1 1234 < ./test/server_file.txt

For further reference: https://www.computerhope.com/unix/unohup.htm

Upvotes: 1

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