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This article mainly introduces "what are the differences between command options and parameters in CentOS". In daily operation, I believe many people have doubts about the differences between command options and parameters in CentOS. Xiaobian consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts of "what are the differences between command options and parameters in CentOS?" Next, please follow the editor to study!

After logging in to Linux, we can enter commands after the # or $sign, sometimes followed by "options" (options) or "parameters" (arguments). That is, the format of the command in Linux is:

The brackets in command [options] [arguments] / / represent optional, that is, some commands do not require options or arguments, while others require multiple options or arguments at run time.

Option options:

The option is the switch that adjusts the execution behavior of the command, that is, different options determine the display result of the command.

Options are divided into long options and short options.

Short options: for example,-h, L, L, M, M, S, etc.

L short options are guided by'-', and when there are multiple short options, spaces are used to separate them.

Short options for some commands can be combined, for example,-l-h can be combined into-lh

Some commands have short options without -, which is often called a BSD-style option, such as ps aux.

Some short options require parameters with the option itself, such as-L 512m

Long options: for example-- help,--list, etc.

L long noodles are all complete words

L long options usually cannot be combined

If parameters are required, parameters with long options usually need'=', such as-- size=1G

Parameter arguments:

Parameters refer to the object of the command.

For example, the ls command shows the current directory without parameters, or you can add parameters, such as ls / dev, and the output result is the / dev directory.

At this point, the study of "what are the differences between command options and parameters in CentOS" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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