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This article mainly introduces shell how to compare the revision time of the file, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

Compare the modification time of a file

`file1`.`txt-nt file2`.`txt `& & echo true | | echo false`file1`.`txt-ot file2`.`txt` & & echo true | | what is echo falseshell? Shell is a program written in C language, which serves as a bridge for users to use Linux. Shell is both a command language and a programming language. Shell also refers to an application that provides an interface through which users access the services of the operating system kernel.

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