- Load the miniroot from your current distribution.
Begin by loading the miniroot from your current distribution. (Refer to
for information on how to load the miniroot).
- Invoke an IRIX shell.
Use the shroot command to escape to a root shell, enter sh to
start a Bourne shell, and then use showfiles to create a list of
modified configuration files:
Inst> shroot
# sh
# showfiles -s -c -m > /usr/tmp/configlist
- Edit the configuration files list (optional).
If you want to edit the list of configuration files to add additional files or
remove unnecessary files, you can do so now by setting your TERM
variable and using vi(1):
# TERM=vt100; export TERM
# vi /usr/tmp/configlist
- Create backup configuration files.
When you are satisified with /usr/tmp/configlist, create the backup
configuration files and then quickly replace the password and hosts files (in
case of disaster while performing the rest of the procedure):
# sh -c `while read fname; do mv $fname $fname.bak; done'
</usr/tmp/configlist
# cp /etc/hosts.bak /etc/hosts
# cp /etc/passwd.bak /etc/passwd
# exit
# exit
Inst>
Note: The < /usr/tmp/configlist portion that appears on the
second line of this example should be included at the end of the first line in
your enty.
- Remove target software.
Remove all currently installed software. At the Inst prompt, enter the
commands shown below. It is critical that you not give any other commands at
the Inst prompt at this time.
Inst> set rulesoverride true
Inst> view targ
Inst> remove I
Inst> go
If you receive a device busy error at this point
and receive the Interrupt
menu, select Continue. When Inst is finsihed and you quit, you may be
asked if you really want to quit. Enter y for yes.
Inst> quit
Please wait ...
Ready to restart the system. Restart? { y(es), (n)o, (sh)ell, (h)elp } sh - Enter the sh command to get a shell prompt.
- Remove installation history files.
After escaping to the shell, remove all files that make up what is known as
your installation history, and then restart the system:
# rm -rf /root/var/inst
# exit
Ready to restart the system. Restart? { y(es), (n)o, (sh)ell, (h)elp } y - Load the miniroot from the older distribution.
Use the older software distribution that you located at the beginning of this
procedure to load the miniroot and invoke Inst; be sure the installation tools
and the software version match.
- Install the older software version.
Remember that Inst no longer has valid software installation information about
this system, so its initial selections are the default selections (see
"Required and Default Subsystems"
). Use Inst to specifically select for installation any additional software
you wish to install.
- Reboot your system.
- Merge configuration files.
In IRIX, merge your config.bak files (listed in /usr/tmp/configlist)
with the restored configuration files.
- If you created a backup copy of customized configuration files (described
in
"Backing Up the Target Systems"
) when you were running this release earlier, you should be able to restore
the configuration files from that backup and use them. Add any new
configuration information that has been added since they were last used.
- If you have no backup of the current system files, compare the .bak
and installed versions of the files in /usr/tmp/configlist, then make
the required changes using a process similar to the one for merging
configuration files described in
"Merging Configuration Files"
`. Be careful not to introduce new features from the later release.
If you modified any configuration files, you should restart the system now to
boot from the desired configuration.
