command the difference between Cat and TAC

The command cat is used to view the contents of a file and display it on the screen, and cat can follow the file name without any options.

The command TAC also displays the contents of the file on the screen, except that the last line is displayed first, then the second-to-last line is displayed, and the first line is displayed.

You can compare the "cat file a > B" with the "TAC file a > file C" two command output file B and file C to see the effect.

In addition, two symbols ">" and ">>" are used in conjunction with both commands

The symbol ">>" is similar to the symbol ">", and its role is also redirection, that is, the previous content is entered into the following file, the symbol ">>" is "append" meaning. When using the symbol ">", if there is content in the file, the contents of the file will be deleted, and the use of the symbol ">>" will not delete the original content.

command the difference between Cat and TAC