Do something with every repository

For example: easily update all your repos if they are located in the same directory

Uniformity is good and sane structure is good. I access a few different SVN servers, so I have organized my repositories by SVN server and then all the projects underneath.

% cd ~/develop/svn-CPAN-logicLAB/
% ls -1
BDKCPR
BDKCVR
BDKFI
BDKPHN
BDKPO
BDKPST
BJONASBN
BOPCC
DAND
MBB
MTS
NIKEPUB
PCLL
PCPLPSD
PCPLRSB
PCPMPUL
PCPMRVF

With this organisation it is possible for me to work on all repositories easily and I can update all using this simple command from the CLI.

% find . -depth 1 -type d -exec bash -c "cd '{}' && pwd && svn up" \;

You can of course change the Subversion command to suit your needs, I have also used the same structure for cleaning up cruft left behind and not belonging under version control using status

% find . -depth 1 -type d -exec bash -c "cd '{}' && pwd && svn up" \; | perl -ne 'if (/^\?/) { s/\?\s+//; print, "\n"; }' | xargs rm