`wc`

学习地址：

• https://www.tecmint.com/wc-command-examples/

The wc(word count) command in Unix/Linux operating systems is used to find out number of newline count, word count, byte and characters count in a files specified by the file arguments.

The syntax of wc command as shown below:

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$ wc [options] filenames

The following are the options and usage provided by the command:

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wc -l : Prints the number of lines in a file.
wc -w : prints the number of words in a file.
wc -c : Displays the count of bytes in a file.
wc -m : prints the count of characters from a file.
wc -L : prints only the length of the longest line in a file.