Misc UNIX Tips and Tricks

So what is this place?

I started to notice that I needed a section of UNIX stuffs that weren't necessarily related to a particular flavor of UNIX instead of putting them all in the Solaris section (the flavor I am most partial to).

How to check your POP3 e-mail via telnet.
Big Brother is a nice little system monitoring product.
How can I get multiple virtual windows using one telnet session? Here is a short BigAdmin how-to article on screen.
What is the easiest way to move files between directories? Use tar.
How can I get find/grep to print the filename a match was found in when searching multiple files?
How can I sort a file by IP addresses?
How can I print a file from a remote UNIX server to my local PC's default printer using a terminal emulator program?
How can I automate an FTP job?
How can I automate an SFTP job?
Here are the top 10 FAQ's about SSH.
How can I automate interactive tasks? Use Expect.
Here is a quick one-liner to see which filesystems are greater than 90% full.
How can I make sure my Oracle DB is up? Use tnsping.
How to make traveling around between sites just a little bit easier with PuTTY.
Why shouldn't you use csh for scripting?

Comments, suggestions, complaints, nifty tip to add?