19 lines
630 B
Markdown
19 lines
630 B
Markdown
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# The `nohup` command
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When a shell exits (maybe while logging out of an SSH session), the HUP ('hang up') signal is send to all of its child processes, causing them to terminate. If you require a long-running process to continue after exiting shell, you'll need the `nohup` command. Prefixing any command with `nohup` causes the command to become _immune_ to HUP signals. Additionally, STDIN is being ignored and all output gets redirected to local file `./nohup.out`.
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### Examples:
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1. Applying nohup to a long-running debian upgrade:
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```
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nohup apt-get -y upgrade
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```
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### Syntax:
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```
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nohup COMMAND [ARG]...
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nohup OPTION
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```
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