Seagate ST150176LC Instrukcja Użytkownika Pobierz pdf (Strona 11)

epic4 Configuration and Administration Guide

Users and Groups

There are seventeen normal (i.e. non-system) users with accounts on epic4. Some of these

are unused and locked, but still present as those users’ files are still present and in use. Table

4 shows their details, replicating the information within /etc/passwd.

Username Real name Groups Status

sse Steve Sembay xra, epic Active

rds Richard Saxton xra Active

md Mike Denby xra, epic Active

afa Tony Abbey xra, epic Active

adts Alex Short xra, epic Locked

rgg Gareth Griffiths xra, epic Locked

ljg Liam Gretton xra, epic Active

pbe Paul Bennie xra, epic Active

jnr James Reeves xra Locked

rma Richard Ambrosi xra Active

tm Theresa Mineo xra Locked

kpa Kim Page xra, epic Active

dbl Darren Baskill xra, epic Active

km77 Kallol Mukerjee xra Active

amr30 Andy Read xra, epic Active

guest1 Guest Account 1 xra Locked

epic epic4 admin xra, epic Locked

Table 4 - User details

A locked status means that the user’s account is either explicitly locked (with passwd –l) or

has no password set (users cannot login with a null password). I never delete accounts as they

become unused, as it makes future audits of file ownership and so on impossible; should a

user leave the system, it is safer to lock their account and keep their details, deleting their

home directories to save space if necessary.

Usernames and user and group IDs are identical to their counterparts on the Starlink systems,

so should epic4 ever be brought under the control of Starlink, the transition shouldn’t be too

painful. The only exception is the epic group, which was created to separate non-calibration

XMM data from everything else in the xra group that all our users are allowed access to. The

epic group has GID 2000.

Each user has a home directory under /home, named after their username. Each user also has

his or her own directory under /work. Neither of these have any quotas enforced.

The epic user account is a throwback to the old epic4 system, and is now unused.

Users are created with the following command:

useradd –u

uid

–g xra –d /home/

user

–s /bin/tcsh –c “

Real Name

” –M

user

The username

user

and its associated user ID

uid

must be discovered by asking one of the

Starlink administrators. Non-Starlink users should be given access to the guest account, more

of which can be added as necessary. The –M switch to useradd creates the home directory,

using the template /etc/skel, which contains nothing much more than the common .cshrc,

.coloursrc and .login files that each user needs.

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