用法：wc [選項]… [文件]…
或：wc [選項]… –files0-from=F
Print newline, word, and byte counts for each FILE, and a total line if
more than one FILE is specified. With no FILE, or when FILE is -,
read standard input. A word is a non-zero-length sequence of characters
delimited by white space.
The options below may be used to select which counts are printed, always in
the following order: newline, word, character, byte, maximum line length.
-c, –bytes print the byte counts
-m, –chars print the character counts
-l, –lines print the newline counts
–files0-from=文件 從指定文件讀取以NUL 終止的名稱，如果該文件被
指定爲”-“則從標準輸入讀文件名
-L, –max-line-length 顯示最長行的長度
-w, –words 顯示單詞計數
–help 顯示此幫助信息並退出
–version 顯示版本信息並退出
