How can I get log messages from the LAMP server on Ubuntu 10.04? Should I install some good program on Ubuntu for that purpose?
cat is not a good idea, especially if logs grow large. Instead, try tailing.
sudo tail /var/log/apache2/error.log
tail will only show the last N lines of a file. If you want to keep monitoring the last lines, use the
-F command-line option . Use Ctrl + C to close the monitoring.
sudo tail -F /var/log/apache2/error.log
To enable the logging, you must do that in the
php.ini (look for error-logging). AFAIK that is no longer on by default in Ubuntu 10.04.
If you have to watch multiple files I'd suggest multitail. It lets you divide the screen and watch multiple files:
By default, the display of error messages is disabled in Lamp with Ubuntu 10.04 (I think it was enabled before...). You can read it with the following command :
sudo cat /var/log/apache2/error_log
sudo cat /var/log/apache2/access_log
I don't know how to re-enable the display of error messages, but it was really useful.