Linux System command Introduction (i)

Linux commands are divided into built-in commands and external commands

type COMMAND you can tell whether a command is a built-in command or an external command

Built-in commands get help:

Example: Help CD

External command Get help:command--help

Example: LS--help

Both built-in commands and external commands can be used to obtain help document information with the Man command, and are shown in chapters

Example: Man date

Sub-chapters:

1. User command (/bin,/usr/bin/,/usr/local/bin)

2. System call

3. Library users

4. Special Documents

5. File format

6. Games

7. Miscellaneous

8. Management Order (/sbin,/usr/sbin,/usr/local/sbin)

In which section of a command:whatis command

Whatis ls

LS (1p)-list directory contents

LS (1)-list directory contents

Can be used : Man 1 ls

Man Flip Screen shortcut key :

Turn back one screen: SPACE

Turn One screen forward: b

Turn back one line: ENTER

Turn One line forward: K

Find:

/keyword: Looking backwards N: Next N: Previous

Keyword: Looking forward from backward N: Next N: Previous

Q: Indicates exit

Online Help Documentation:info COMMAND(not used)

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Linux System command Introduction (i)