Rookie Advanced Linux Master Road--the fifth day

Linux:rtc

Hardware clock: Hwclock

System clock: Date

How to get the use of commands help :

internal command: Help command

External command: Command Help

Command Manual : Manual

Mans COMMAND

Catalogue sub-chapters (Bin,/usr/bin,/user/local/bin)

1: User Command 2: System call 3: library call (user)

4: Special file (device file → as device access portal) 5: File format (conforms to profile syntax)

6: Game 7: Miscellaneous Miscellaneous 8: Administration Command (/sbin,/usr/sbin,/usr/local/bin)

What's command to see which chapter

[] means can be omitted, | Indicates what must be given for multiple-choice 1,<>

... can appear multiple times; {} group

Mans

Name: command name and brief description Synopsis usage notes

DESCRIPTION: A detailed description of the command function, which may include the meaning of each item

Files: The configuration file associated with this command

Examples: Using the example

Turn back one screen: space

Turn One screen forward: B

Turn back one line: Enter

Turn One line forward: K

Find :

/keyword Back Search (n: Next, N: Previous)

？ Keyword forward search (n: Previous, N: Next)

Modified: Date of day and age. Seconds

Hwclock (Read time)

-W will system → Hardware

-S will hardware Time → system

Online Brochure:

Info.command

Document :/usr/share/doc

Cal:calander Calendar

Practice :

1.echo is an internal command or an external command?

2. Use Help

3. Use line break display

4.file commands and their usage

Print f (no line break) plus \ n with line break

Including the use of commands, command Help to obtain methods, the precise use of the man command process

Windos:pe linux:elf

File System :

Rootfs: With File system

Fhs:linux

/boot: System boot related files such as kernel, INITRD, and grub (boot loader)

/dev: Device file (no size, as access to device)

Block device: Random device (access), data block

Character Devices: Linetype access, character-by-characters input → by character

Device number: Main device number (major) and secondary device number (minor)

/etc: Configuration file

Home directory for users, the home directory of each user is usually the default of/home/username

/root: Administrator's home directory

/lib: library file →/lib/modules: Kernel module file

Static dynamic 1/3/2 3 (library)

↓

Facilitates individual management of programs

/media: mount point directory (put a device, with the current system, a directory, the process of establishing a relationship)

Rookie Advanced Linux Master Road--the fifth day