Xenix Help ? MapChan : Shell Layers : Backup : File Locking

[Ashley M. Aitken]

G'Day,

I have a couple of questions/problems  relating  to  the  use  of
xenix, if anyone could help me find solutions I would be most ap-
preciative.  The xenix system I am working on is version 2.3.1 on
a compaq 386 with a stallion (brumby = 4 port) serial board.

Mapping Keys:

I would like to map some keys on a Freedom Liberty (Wyse 50) key-
board  (the  keys  around  the  numeric  pad) to some other ascii
values (ie + * ...). What is the simplest way to do  this?  There
are  2 terminals I wish to do this for, the other and the console
I do not. I looked briefly at mapchan, but got lost,  is  it  the
answer?

Shell Layers:

When I try an run shell layers on anything but the console I  get
an error (the number and message at the moment eludes me, perhaps
error number 25: unable to ???). Is  it  possible  to  run  shell
layers  on  other than the console, and if so why are my attempts
failing? Do I need to reconfigure the system?

Backup:

Does the backup work on a daily schedule or on  the  sequence  of
backups, that is, if I was supposed to back up on Friday, but ran
backup on Thursday, it would tell me, no backup for  today.  This
is  what  I  have encountered, and I would like to know how I can
alter the day (for example, if I did wish to do  the  backups  on
Thursday  now-on). What happened was I started by backup schedule
on the wrong day, and now the schedule seems to be out of  synch.
It  won't let me do the backup I wish to do on Friday until it is
Sunday. How can I resynchronize the backup sequenc? Should I just
postpone  a  Sunday Backup till the next Friday? Can I change the
recorded epoch date?

Also is it possible to use two different media for backup, ie the
cartridge tapes for full dumps and floppies for incremental back-
ups?

File "Locking":

I would like to lock a file while someone is editing it, that is,
if  someone edits a file then it is not possible for someone else
to edit (ie attempt to change) that file. The  point  being  that
only one of the edits could survive. Normal file locking does not
seem to be valid in this case (perhaps I am  missing  something),
because  the  editor  take  a  copy of the file and then works on
that. At present I have created an  edit  command  shell  script,
that  copies  the  file into another file and edits that file (if
that file does not exist) otherwise it just opens  the  file  for
reading only. Is this the easiest way to do this?

If anyone has any ideas or suggestions on the above  I  would  be
most  grateful if you could please e-mail me at the address given
below.

Thanks in Advance,

Ashley Aitken.


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