Find

Find

List all sub directory/file in the current directory

find .

List all files under the current directory

find . -type f

List all directories under the current directory

find . -type d

Edit all files under current directory (e.g. replace 'www' with 'ww')

find . -name '*.php' -exec sed -i 's/www/w/g' {} \;

# if there are no subdirectory
replace "www" "w" -- *
# a space before *

Find and output only filename (e.g. "mso")

find mso*/ -name M* -printf "%f\n"

Find large files in the system (e.g. >4G)

find / -type f -size +4G

Find and delete file with size less than (e.g. 74 byte)

find . -name "*.mso" -size -74c -delete

# M for MB, etc

Find empty (0 byte) files

find . -type f -empty
# to further delete all the empty files
find . -type f -empty -delete

Recursively count all the files in a directory

find . -type f | wc -l