Some quick CLI commands I use all the time but forget the exact syntax for.

Find all files that have been modified in the past 7 days

find . -mtime -7

Find all JPEGs that have been modified more than 30 days ago

find . -name \*.jpg -mtime +30

Move all JPEGs from the current folder (recursively) that are greater than 40k into the folder /tmp/2

mv `find ./ -name \*.jpg -size +40k` /tmp/2

Tell me info about files in the current folder

file `ls`

Tell me info about all of the mp3 files in this folder

find . -name \*.mp3 -exec file '{}' \;

Clean subversion metadata out of a directory

find . -name .svn -type d -exec rm -r '{}' \;

Use the above to make an export of a working copy by doing:

cp -R ./working_copy ./working_copy_export
find ./working_copy_export -name .svn -type d -exec rm -r '{}' \;

Any command that is deleting files will prompt you for each file. to go through them all without prompts, just run the command as root

sudo find ./working_copy_export -name .svn -type d -exec rm -r '{}' \;