Marco Note 08_01~~~08_04

Facl:

Filessystem Access Control List

Use file extensions to save additional access control permissions.

jerry:rw-

Set Facl

-M: Set

U:uid:perm

G:gid:perm

-X: Cancel

U:uid

G:gid

Get Facl (Cancel)

The file attributes end with the "+" sign, which is the extended property of the file. If you copy or archive such a file, the additional properties of the new file will be discarded unless you use a special command.

Terminal type:

Console: Consoles

Pty: Physical Terminal (VGA)

TTY: Virtual terminal (VGA)

TTYs: Serial Terminal

pts/#: Pseudo-terminal (terminal formed under pseudo-file system)

Sleep

Last: Displays the/var/log/wtmp file. Displays user login history and system restart history.

-N #: Displays information about recent # times:

Lastb,var/log/btmp file that displays user error login attempts.

-N #:lastlog Displays the last successful logon information for each user:

-U USERNAME: Displays the most recent login information for a specific user.

BaseName

$: Script path and name for script execution

Random: Generates a stochastic number,

echo $RANDOM

Hostname: Displays the primary current machine name

Random number generator:

/dev/random

/dev/urandom

08_02

Case USAGE:

#!/bin/bash

#

Case $ in

' Start ')

echo "Start server ...";;

' Stop ')

echo "Stop server ...";;

' Restart ')

echo "Restart server ...";;

*)

echo "' basename $ ' {start|stop|restart|status}";;

Esac

Command:

./service.sh Start

Example two:!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Let the script show the details:

#!/bin/bash

#

Debug=0

Case $ in

-v|--verbose

Debug=1;;

Esac

[$DEBUG-eq 1] && echo ' Hello. '

08_03

Disk and file explanation

MBR: Not part of the operating system

Low-level formatting

Partition File System

MBR: Master boot Record (512byte)

Master Boot Record

Main Boot Record

446bytes:bootloader, program

64bytes:

16bytes: Identifies a partition (maximum of 4 primary partitions)

2byte:

Last two: Magic number

Mark MBR is valid

Hard links:/backup/a/m.txt/backup/b/n.txt directly to the different paths of the same inode, which can be called a link.

---->1, can only be created on files and cannot be applied to a directory.

2, can not cross the file system;

3. Creating a hard link increases the number of times a file is linked

Symbolic Link: (soft link)--small link is the quickest way.

To create a connection command:

ln

Example:

Ln/tmp/abc/tmp/abc2

Ls-i (show inode number)

2981891 ABC

2982891 ABC2

Df-p on same line, no line break

08_04

/dev

Main device number (major numbers)

Identifies the device type.

This device number (minor numbers)

Identifies a different device in the same type.

Mknod (Create a device file (block or character file))

Pipeline files, FIFO files.

The device file name of the hard disk device.

IDE, ATA, HD

Sata:sd

Scsi:sd

Usb:sd

A, B, c ... To differentiate different devices under the same type.

IDE: First IDE port: Master, slave

Dev/hda/dev/hdb

Second IDE port: Master, slave

Dev/hdc/dev/hdd

Hda

HDA1: First primary partition

HDA2:

Hda3:

HDA4:

HDA5: First logical partition.

Check that the current system recognizes several hard drives:

fdisk-l [/dev/to/some_device_file]

Vfs:virtual Filesystem.

In Linux, all file systems are eventually converted to VFS

To manage disk partitions:

Fdisk:/DEV/SDA

P:

N: Create new partition->p: Main zone->e: Extended partition.

D: Delete a partition

W: Save exit

Q: Do not save exit

T: Modify the partition type

L

L: Displays all supported types.

Marco Note 08_01~~~08_04