-L Write the length of the line containing the most bytes (default) or characters (when -m is provided) to standard
output. When more than one file argument is specified, the longest input line of all files is reported as the
value of the final “total”.
-c The number of bytes in each input file is written to the standard output. This will cancel out any prior usage of
the -m option.
-l The number of lines in each input file is written to the standard output.
-m The number of characters in each input file is written to the standard output. If the current locale does not
support multibyte characters, this is equivalent to the -c option. This will cancel out any prior usage of the -c
option.
-w The number of words in each input file is written to the standard output.
ので、ディレクトリのファイル数はおとなしく ls | wc -lとかするしかない
