sysadmin

The cron jobs for each web site are created as the user associated with that web site: the user accesses it with the crontab command

For instance:

su exampleuser
crontab -l

To see what cron jobs that user has, which should contain the "drush -r /var/local/drupal/exampleuser/web cron", where exampleuser is the site project name (which may or may not be identical to the username, but is in any case owned by the user).

The admin (root) can see them all in /var/spool/cron/crontabs

grep -h \* /var/spool/cron/crontabs/*

sudo vi /etc/trac/trac.ini

Updated the attachment max size line to this:

[attachment]
max_size = 5242880

This made it 5 MB (I just multiplied their number of bytes, which equaled 250Kb, by 20).

Reference

http://trac.edgewall.org/wiki/0.11/TracIni