Helpful posts on best practices for sysadmins

I'll probably add more as I find them.

http://serverfault.com/questions/4176/what-sysadmin-things-should-every-programmer-know
This answer to the above specifically covers how to debug networking issues for devs:
http://serverfault.com/a/4303/75301

A Small List of Best Practices for Sysadmins and Programmers - has a lot of links to other helpful pages

Linux: 25 PHP Security Best Practices For Sys Admins

grep in a bunch of files

I always have to look this up so I'm posting a note to myself here. To grep through all the files in a directory, recursively, and only get back a list of the files containing the string, do

$ grep -lr "searchterm" location

E.g.:

$ grep -lr "Enum" /var/log/rtr/pops

$ grep -lr "receipt" .

Found this in this blog.