rm -rf `find . -type d -name .svn`

find ./ -type f -type d -newermt 2007-06-07

find . -name '*.shtml' -type f -print0 | xargs -0 sed 's/mitarbeiter-und-studenten/staff/g' -i 

Replaces mitarbeiter-und-studenten with staff. BE careful with that!!!!

find <dir> -type d -exec chmod g+s {} \;

Copy the content of one directory into an other already existing directory

cp /dir/. /dir2/ -R

pdftk original.pdf dump_data output metadata.txt

edit metadata.txt … and back into the pdf:

pdftk original.pdf update_info metadata.txt output new.pdf