This is a little dumping ground for me to use to store useful recipes.

Find a file that was created between two ranges, say on the same day…

touch -t 201608200000 start
touch -t 201608202359 stop
find . -newer start \! -newer stop

Find all files with a particular name or extension and delete if you want

find . -name "*.bak" -type f -delete

Just run without -delete to review before you do it

Find files or directories with a certain permissions set, or without a certain permissions set

find files that don’t have permissions of 644
find /path/to/dir/ -type f ! -perm 0644 -print0

find files that don’t have permissions of 644 and change them
find /path/to/dir/ -type f ! -perm 0644 -print0 | xargs -0 chmod 644

counts all .php and .html files from the current directory that aren’t under the “includes” or “forum” directories.
wc runs wordcount on each file that matches. the “tr” through “bc” takes those numbers and adds them up.

find . -not \( -path ./includes -prune \) -not \( -path ./forum -prune \) -regex ‘.*/.*\(php\|html\)’ -exec wc -l \{\} \; | tr -s ‘ ‘ ‘ ‘ | cut -d ‘ ‘ -f 2 | paste -sd+ – | bc