What is the meaning of the number followed by the keyword in Linux

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In Linux's shell environment, when we encounter a command that we don't understand, we usually choose to check the man manual. Of course, if you are used to baidu or google, you can.

When we look at the man manual, we usually find that at the beginning and at the end, there is a keyword followed by a parenthesis and a data written in parentheses.

For example, when we look at the date command and we type man date, we will send a DATE (1) first, so what does this 1 mean? And then I'm going to come down to the meaning of this number.

The meaning is as follows:

1. An instruction or executable program that a user can call in the shell environment of Linux. Such as date,bc, etc.

two。 A program or tool that the system core can call directly.

3. Commonly used programs (function) or libraries (usually c library)

4. Description and explanation of the device. Usually under the / dev directory.

5. The format of the configuration file or some files.

6. Games

7. An agreement or convention. For example, the things I am writing now belong to this one.

8. Administrative instructions available to the system administrator

Files related to 9.kernal.

In addition, when looking at the man manual, sometimes you want to search for a word, you can do this, just type "/" + the word you want to search for. Shell will highlight all the words that meet the requirements. Press n to look down, N to reverse; if you want to look up, you can directly enter "?" + the word you want to search will search up, press n to go up, and press N to reverse it.

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