[md]
```
# wc --help
-c, --bytes 输出字节数统计
-m, --chars 输出字符数统计
-l, --lines 输出行数统计
--files0-from=F read input from the files specified by
NUL-terminated names in file F;
If F is - then read names from stand-ard input
-L, --max-line-length print the maximum display width
...
# wc --help
-c, --bytes 输出字节数统计
-m, --chars 输出字符数统计
-l, --lines 输出行数统计
--files0-from=F read input from the files specified by
NUL-terminated names in file F;
If F is - then read names from stand-ard input
-L, --max-line-length print the maximum display width
-w, --words print the word counts