Fix service.exists

[sblaisot]

service.exists fail with systemd because there was a typo in the underlying command, missing a space between grep option -q and service name.

This PR fixes that problem

This fixes#768

[martinhoyer]

Thanks for the fix.
I wonder what the ^ is for. Isn't it redundant?

[sblaisot]

I wonder what the ^ is for. Isn't it redundant?

The ^ in the beginning of a regex means "beginning with" (start of line)

I only corrected the missing space between -q option and the searched regex.

[martinhoyer]

I wonder what the ^ is for. Isn't it redundant?

The ^ in the beginning of a regex means "beginning with" (start of line)

Ah, I always get confused by the % substitution :)

I only corrected the missing space between -q option and the searched regex.

Of course, I was just curious.

[philpep]

I wonder what the ^ is for. Isn't it redundant?
I only corrected the missing space between -q option and the searched regex.

Of course, I was just curious.

I think this is to match service with or without the ".service" suffix. Maybe we could think about a better way of doing this because service s (which obvisouly doesn't exist) will match ssh.service and reported as existing.

[philpep]

Merged, thanks!