wc

NAME
    wc - print the number of newlines, words, and bytes in files

SYNOPSIS
    wc [OPTION]... [FILE]...

DESCRIPTION
    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.

PARAM
    -m, --chars
        print the character counts

    -c, --bytes
        print the byte counts

    -w, --words
        print the word counts

    -l, --lines
        print the newline counts

    -L, --max-line-length
        print the length of the longest line //最长行的宽度

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