Measure disk space of certain file types in aggregate
This will report disk space usage in bytes by extension:
find . -type f -printf "%f %s\n" | awk '{ PARTSCOUNT=split( $1, FILEPARTS, "." ); EXTENSION=PARTSCOUNT == 1 ? "NULL" : FILEPARTS[PARTSCOUNT]; FILETYPE_MAP[EXTENSION]+=$2 } END { for( FILETYPE in FILETYPE_MAP ) { print FILETYPE_MAP[FILETYPE], FILETYPE; } }' | sort -nOutput:
3250 png30334451 mov57725092729 m4a69460813270 3gp79456825676 mp3131208301755 mp4