[NAME]du \- estimate file space usage[DESCRIPTION].\" Add any additional description here[PATTERNS]PATTERN is a shell pattern (not a regular expression).  The pattern.BR ?matches any one character, whereas.BR *matches any string (composed of zero, one or multiple characters).  Forexample,.BR *.owill match any files whose names end in.BR .o .Therefore, the command.IP.B du --exclude='*.o'.PPwill skip all files and subdirectories ending in.BR .o(including the file.BR .oitself).