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disown
Another way to ignore the HUP signal is with the disown built-in.[14]disown takes as an argument a job specification, such as the process ID or job ID, and removes the process from the list of jobs. The process is effectively "disowned" by the shell from that point on, i.e., you can only refer to it by its process ID since it is no longer in the job table.
disown's -h option performs the same function as nohup; it specifies that the shell should stop the hangup signal from reaching the process under certain circumstances. Unlike nohup, it is up to you to specify where the output from the process is to go.
disown also provides two options which can be of use. -a with no other arguments applies the operation to all jobs owned by the shell. The -r option with does the same but only for currently running jobs.
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