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UGU: Unix Guru Universe - Unix Tip #4536- August 12, 2025
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Unix Tip #4536- August 12, 2025
NULL ROOT PASSWD WITHOUT VI
As admins We never forget the root password,
RIGHT?
Although sometimes we do inherit machines in
which we don't know the root password.
Here is a way to null the root password from
the password file.
It comes a time in every admins life that we
will have to go into mini-root and change the
password file without the use of vi.
The following example shows how to achieve this
on the /etc/shadow file, but the same basic
commands can be achieved on the /etc/passwd file
for those platforms that don't support shadow
passwords.
Use "ed" - and the 13 dots method
---------------------------------
# cp /etc/shadow /etc/shadow.bak
# ed /etc/shadow
1p
s/:.............:/::/
1p
w
q
NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted
by various unix admins around the globe. UGU suggest you read and
test each tip in a non-volitile environment before placing into
production.
LAST 5 TIPS
4535
- THE EXECUTION OF FIND
4534
- PROTECT THE ROOT DIRECTORY AT ALL COST
4533
- KEEP THOSE DAEMONS RUNNING
4532
- BE CAREFUL WITH NIS+
4531
- TAKE NOTES AT 3AM
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