Difference between /etc/crontab and “crontab -e”

Question

What is the difference between the crontab located in /etc/crontab and the crontab that can be edited using crontab -e?

Answer 1

As Ignacio said, /etc/crontab is the system wide crontab.

The format of /etc/crontab is like this:

# m h dom mon dow user  command
* *  * * * someuser echo 'foo'

while crontab -e is per user, it's worth mentioning with no -u argument the crontab command goes to the current users crontab. You can do crontab -e -u <username> to edit a specific users crontab.

Notice in a per user crontab there is no 'user' field.

# m h  dom mon dow   command
* * * * * echo 'foo'

In Linux distros, per user crontabs are typically stored in: /var/spool/crontabs/<username>

Answer 2

One is the system crontab and can only be edited by root, and the other is the user crontab and can be edited by a user and exists per user.