I have 357 .png files located in different sub dirs of the current dir:

settings# find . -name \*.png |wc -l
    357

settings# find . -name \*.png | head
./assets/authenticationIcons/audio.png
./assets/authenticationIcons/bbid.png
./assets/authenticationIcons/camera.png
./bin/icons/ca_video_chat.png
./bin/icons/ca_voice_control.png
./bin/icons/ca_vpn.png
./bin/icons/ca_wifi.png

Is there a oneliner to calculate the total disk space occupied by them (before I pngcrush them)?

I've tried (unsuccessfully):

settings# find . -name \*.png | xargs du -s
4       ./assets/support/wifi_locked_icon_white.png
1       ./assets/support/wifi_vpn_icon_connected.png
1       ./assets/support/wi_fi.png
1       ./assets/support/wi_fi_conected.png
8       ./bin/blackberry-tablet-icon.png
2       ./bin/icons/ca_about.png
2       ./bin/icons/ca_accessibility.png
2       ./bin/icons/ca_accounts.png
2       ./bin/icons/ca_airplane_mode.png
2       ./bin/icons/ca_application_permissions.png
1       ./bin/icons/ca_balance.png