λ nohup --help
Usage: nohup COMMAND [ARG]...
or: nohup OPTION
Run COMMAND, ignoring hangup signals.
--help display this help and exit
--version output version information and exit
If standard input is a terminal, redirect it from an unreadable file.
If standard output is a terminal, append output to 'nohup.out' if possible,
'$HOME/nohup.out' otherwise.
If standard error is a terminal, redirect it to standard output.
To save output to FILE, use 'nohup COMMAND > FILE'.
NOTE: your shell may have its own version of nohup, which usually supersedes
the version described here. Please refer to your shell's documentation
for details about the options it supports.
GNU coreutils online help: <http://www.gnu.org/software/coreutils/>
Report nohup translation bugs to <http://translationproject.org/team/>
Full documentation at: <http://www.gnu.org/software/coreutils/nohup>
or available locally via: info '(coreutils) nohup invocation'
开启不挂起的服务, ssh退出后依然运行服务
nohup python3 main.py --cmd=runserver