Difference between ctrl-z and in linux

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My understanding is that when you are running any command within a given shell (say bash), what's happening under the hood is that a fork system call is called, and sleep 10 is now running as a child process with the parent being the bash shell I executed the sleep.

Now, if I want to send sleep to the background, I would either do sleep 10 & or run sleep 10 and press ctrl+z so the process is sent to the background. pstree shows that using any of these options, sleep keeps being a child process of the bash shell.

Now my question is, when doing this through SSH, I noted the following: If I do: sleep 999 & and sleep 888 <- followed by a ctrl+z, and the close the ssh session, only sleep 999 & survived.

Why is this? I actually was expecting one of these:

  • both processes get terminated because the parent process is gone

  • both processes get associated to init as the parent process.


 

Apr 13, 2022 in Linux Administration by Soham
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