I think it would be a good idea to mention the tee command, probably somewhere in the "Cat, Less, Tail and Head" chapter

I'd like to be able to run commands on all lines of a file. For example, bsed wrap lines with " should execute on all lines of the file. Current workaround is to include some trivial filter like wrap lines containing '.' with "

过滤器/README.md 中wc命令解释有问题

常用选项	描述
l	只统计行数
w	只统计单词数
m	只统计字符数
c	只统计字节数
L	最大行的长度
不管指定选项的顺序如何，其信息显示的顺序都是固定的，遵从上面从上到下的顺序。
若不加参数，则默认显示l，w，m三项。

若不加参数，则默认显示l，w，m三项。说明有误。实际应该等价于 -lwc

ref

By default, wc prints three counts: the newline, words, and byte counts.

People have to scroll too much on the GitHub page to even get to the README

I'm curious the Readme could included the memory and CPU usage between standard unix tools ga and rare?

Another take to benchmark on embedded device is useful.