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Author Topic: what for nobody:nogroup, lp:lp, tc:floppy?  (Read 2218 times)

Offline nick65go

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what for nobody:nogroup, lp:lp, tc:floppy?
« on: August 14, 2016, 07:40:44 AM »
Could you please tell me the trick about few default user:group in tinycore?

===/etc/group; The 'x' means that password is stored in /etc/gshadow
group:password:group_ID:users_CSV
root:x:0:
lp:x:7:lp
nogroup:x:65534:
staff:x:50:

===/etc/gshadow; password !(locked) or * means group members do not need the password;
group_name:encrypted_password:administrators_CSV: users_CSV
root:*::
nogroup:!::
staff:!::
floppy:!::tc

===/etc/passwd; The 'x' means that the user’s password is stored in /etc/shadow.
user:x:user_ID:group_ID:user_name:use_home_folder:user_shell
root:x:0:0:root:/root:/bin/sh
lp:x:7:7:lp:/var/spool/lpd:/bin/sh
nobody:x:65534:65534:nobody:/nonexistent:/bin/false
tc:x:1001:50:Linux User,,,:/home/tc:/bin/sh

1.So, group floppy is not in /etc/group, but only in /etc/gshadow. why?
What is this tc:floppy used for? when?

2. So, group lp is in /etc/group, but not in /etc/gshadow. Why?
What is this lp:lp used for? And when because is disabled?

3. What test/debug is this nobody:nogroup used for? And when because is disabled?

The hints are rely welcome. Thanks



Offline curaga

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Re: what for nobody:nogroup, lp:lp, tc:floppy?
« Reply #1 on: August 14, 2016, 10:14:50 AM »
lp/floppy are likely unused remainders. Nobody (/nogroup) is a standard user, it's used everywhere where something is specifically nobody's. For example, NFS uses it if it can't map an uid.
The only barriers that can stop you are the ones you create yourself.