Init service status
The service --status-all command tries to figure out for every init script in /etc/init.d if it supports a status command (by grepping the script for status).
If it doesn't find that string it will print [ ? ] for that service.
Otherwise it will run /etc/init.d/$application status.
If the return code is 0 it prints [ + ].
If it's not 0 it prints [ - ].
Why does ssh print [ - ] even though it's still running?
ssh is controlled by upstart in Ubuntu (13.10).
Running /etc/init.d/ssh status will produce no output and a return code of 1.
2019-04-16 22:35:21
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