this is something that strangely doesn't happen automatically on ubuntu
in Ubuntu, just add

send host-name "dapperbox";

to your /etc/dhcp3/dhclient.conf file

you might need to do a

sudo /etc/services/networking restart

On your Mac, you can now do

ssh username@dapperbox

instead of

ssh username@1.2.3.4

// generates SSH DSA keys in ~/.ssh/

ssh-keygen -d

rsync -avz --eahfs --progress --delete /source-dir-without-trailing-slash /destination-dir-with-trailing-slash

// explanation of switches
// -a, archive mode, equivalent to -rlptgoD which does things like recurse through all the dirs, preserves times, etc.
// -v, verbose mode
// -z, compress - makes the copy go faster. doesn't actually compress into a zip file
// --eahfs - (could also use -E, I think)
// --progress - show copy status of each item
// --delete, delete files on destination that aren't on source (sync)

// tar:

tar -cvzf file.tar.gz inputfile1 inputfile2

// untar:

tar -xvzf file.tar.gz

// opens Firefox with extensions disabled. Also gives you the ability/option to reset Firefox to defaults.

// More info and code for other platforms can be found at http://kb.mozillazine.org/Safe_mode

/Applications/Firefox.app/Contents/MacOS/firefox -safe-mode

Installing Subversion for local use is general an easy install, but allowing remote access to your svn repository over SSH can be problomatic dependent upon your OS and the means taken to install.

For Darwinports and Fink on OS X the install location has to be added to users $PATHs, but there are extra steps outlined here for use of the svn+ssh means of access:

http://subversion.tigris.org/faq.html#ssh-svnserve-location

A much easier alternate is to sym link the svn binaries to a place on the default PATH (used by the SSH login):

#For Darwinports
ln -s /opt/local/bin/sv* /usr/bin/

#For Fink
ln -s /sw/bin/sv* /usr/bin/

This links all the binaries at once.

setterm -blength 0

Sets the bell length to zero for all applications

ipconfig getpacket en0

According to the manual page for ipconfig, this command appears to be unique to Mac OS X.

The command will display a bunch of useful info, including:

server_identifier (ip): That's your DHCP server's IP address.
yiaddr: Your machine's IP address.
chaddr: Your machine's MAC address.
domain_name_server: Your domain name server(s).

Most useful for providing a consistent uid on machines accessing an NFS mount:

$ sudo find . -xdev -user <old-uid> -print -exec chown <new-uid> {} \;