Remember some useful command

common.sh

# Install imagemagick
sudo apt-get install imagemagick

# Resize jpeg images under subdirectories
find . -name "*.jpg" -exec mogrify -resize 1600x1600\> -quality 75% -verbose -format jpg {} +

# Resize jpeg images only if > 1MB
# http://superuser.com/questions/204564/how-can-i-find-files-that-are-bigger-smaller-than-x-bytes
find . -name "*.jpg" -size +1M -exec mogrify -resize 1600x1600\> -quality 75% -verbose -format jpg {} +

# Resize all images to 120x120 and output in another directory
find . -maxdepth 1 -regextype posix-egrep -regex ".*\.(png|jpg|gif)$" -exec \
mogrify -verbose -resize 120x120\> -format png -path ./small  {} +

# as above, force to square / No filling background
find . -maxdepth 1 -regextype posix-egrep -regex ".*\.(png|jpg|gif)$" -exec \
mogrify -verbose -resize 120x120\> -gravity center -extent 120x120 -background none -format png -path ./small  {} +

# resize, keepaspect ratio and fill blank space
find . -maxdepth 1 -regextype posix-egrep -regex ".*\.(png|jpg|gif)$" -exec \
mogrify -verbose -resize 250x180 -background white -gravity center -extent 250x180\> -format png -path ./small  {} +

# resize portrait to square
find . -maxdepth 1 -regextype posix-egrep -regex ".*\.(png|jpg|gif)$" -exec \
mogrify -verbose -geometry x500 -background transparent -gravity center -extent 500x500\> -format png -path ./small  {} +

# Make all files 644 and 755 for folders (security for Wordpress, PHP, website...)
find . -type d -exec chmod 755 {} \;
find . -type f -exec chmod 644 {} \;

# Rename to lowercase
find . -depth -exec rename 's/(.*)\/([^\/]*)/$1\/\L$2/' {} \;