cat,tac,more

cat VS tac

cat是查看文本文件的内容，tac是cat反过来，反向查看文件

$cat 1.txt 
ls: cannot access ee: No such file or directory
1line
2line
3line
4line

$tac 1.txt 
4line
3line
2line
1line
ls: cannot access ee: No such file or directory

more

查看，扩展翻页,回车下一行，空格下一页，q退出

$man ls | more
。。。。。。。。。。。

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