2016-6-9 Linux Basic Learning-Disk Management

ln [-s-v] SRC DEST
Hard Links
1. Can only be created on files, cannot be applied to the directory
2. Cannot cross file system;
3. Creating a hard link increases the number of times a file is linked.
Symbolic Links
1. Can be applied to the catalogue;
2. Cross-file system available;
3. The number of links to linked files will not be increased;
4. Its size is the number of characters that the specified path contains.


Du-s file path: Show file size
-H file path: unit conversion

DF Displays the status of files in the current directory
-I: How many Inode is available, how many inode has been used
-P: No Line break

Device files:
B: Units in blocks, random access devices;--HDD
C: by character, linear device;--keyboard
/dev
Main device (Major): Identify device type
Secondary device number (minor): identifies different devices in the same type

Mknod
How to use: Mknod [OPTION] ... NAME TYPE [MAJOR MINOR]
-M MODE: Specify Permissions

Device file name for the hard disk device
Ide,ata:hd
Sata:sd
Scsi:sd
Usb:sd
A,b,c ... To distinguish different devices under the same type
Ide:
First IDE port: Master (/DEV/HDA), slave (/DEV/HDB)
Second IDE port: Master (/DEV/HDC), slave (/DEV/HDD)

Bda:
BAD1: First primary partition (maximum of four)
Bad2:
BAD3:
BAD4:
HDA5: First logical partition (can have multiple)
Extended partitions up to one

See how many hard drives are identified by the current system
Fdisk
-L: View the device partition of the current system

To manage disk partitions:
Fdisk/dev/sda
P: Displays the partition of the current hardware, including unsaved changes
N: Create a new partition
E: Extended partition
P: Primary partition
D: Delete a partition
W: Save exit
Q: Do not save exit
T: Modify the partition type
L
L: Show all supported types 650) this.width=650; "Src=" http://s3.51cto.com/wyfs02/M02/82/8D/wKiom1dZT_KCcwztAADAx9tKTUg227.jpg " Title= "Fdisk.jpg" alt= "Wkiom1dzt_kccwztaadax9tktug227.jpg"/>

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2016-6-9 Linux Basic Learning-Disk Management