Stuff I need to lookup every time

Set ignore to all files of a directory with subversion:
$ cd cache
$ svn propset svn:ignore '*' .
$ svn ci . -m 'Ignore set on cache dir.'

Show changed files between two revisions, overview
$ svn diff -r 300:HEAD --summarize

Show changed files between two revisions, for each revision:
$ svn log -v -r 300:304

See overall latest 20 commit-messages:
$ svn log -l 20

Branching and merging:

Only grep in php source files, not jpgs, movies etc.:
$ grep -i 'whatever' `find . -name '*.php' -print`

Add all new files in a large filestructure to subversion, like after an update of vendors in Symfony2
svn st | grep "^?" | awk "{print $2}" | xargs svn add $1

Remove all deleted files from a large filestructure from subversion, like after a vendors update in Symfony2
svn st | grep '^!' | awk '{print $2}' | xargs svn delete --force

Setup external libraries in subversion:
svn mkdir ZFVersions;
svn add ZFVersions;
svn ci ZFVersions -m 'Added dir for all versions.';
cd ZFVersions;
svn mkdir 1.11;
svn add 1.11;
svn ci 1.11 -m 'Added version subdir.'
cd 1.11;
svn propset svn:externals 'Zend' .; # This will checkout in another dir Zend into your dir 1.11. You need this since autoloading is using paths like this require_once(Zend/Feed/Rss.class.php)!!
svn commit -m 'Set external.';
svn up .; # Loads external lib.

Correct date problems in a mysql database – 2020 instead of 2011 in YYYY-MM-DD dates:
UPDATE accounts SET member_startdate = CONCAT('2010', '-', MONTH(member_startdate), '-', DAYOFMONTH(member_startdate)) WHERE YEAR(member_startdate) > 2011;

What is it you guys always look up?