How do I fix my crontab after a username change?

Question

I recently changed my username, and I can't seem to access my crontab now:

% crontab -e
crontab: no crontab for blackl - using an empty one

I thought I'd just edit the one I had under my old username, copypaste the jobs to the new one, and then use crontab -r to remove the old one.

% sudo crontab -eu olduser
crontab: user `olduser' unknown

Oops.

I dug around a bit and found where the crontabs are stored (/usr/lib/cron/tabs) and copied my old one out of there. The first line, though, is this:

# DO NOT EDIT THIS FILE - edit the master and reinstall.

It seems to me that for whatever reason, manually removing the old crontab with something like sudo rm /usr/lib/cron/tabs/olduser would be a bad idea. What is the correct way to do this?

Answer 1

[root@localhost cron]# pwd
/var/spool/cron
[root@localhost cron]# ll
total 4
-rw------- 1 root     root   0 Jul 13 12:06 root
-rw------- 1 max      max    20 Oct 22 12:22 max

Here particular users crontabs are stored.

This is the content of man usermod

-l, --login NEW_LOGIN
           The name of the user will be changed from LOGIN to NEW_LOGIN. Nothing else is changed. In particular, the user´s home directory name should probably be changed manually to
           reflect the new login name.

Here clearly mentioned that Nothing else is changed so the file under /var/spool/cron will not be updated, because this file will be created while creating user account (path may vary in your system)

just rename this file to your new username.

After that type crontab -l it will list your old crontab also.

you are telling that this is not the correct method right?

If i get any other method i will update my post.