One day Linux Command (13) dF du fdisk disk management

DF

Syntax: DF [-ahikmt]
Note: displays the status of the file system or displays the status of all file systems (default value)

Parameters:

-A, -- all contains all file systems with 0 blocks
-H, -- human-readable uses a human-readable format (the preset value does not include this option ...)
-I, -- inodes: List inode information, not list used Blocks
-K, -- kilobytes is like -- block-size = 1024
-M, -- megabytes is like -- block-size = 1048576
-T, -- print-type indicates the format of the file system.

Example:

$ DF-HT

Du

Syntax: Du [-abckms] [directory name]

Description: displays the directory or file size.
Parameter: [directory name] can be omitted. If this parameter is omitted, the file capacity of the current directory is counted.
-A: lists all files and directories. The default value is the value of the List Directory.
-B: the values listed are output in bytes.
-C: Calculate total
-K: The listed values are output in KB.
-M: The listed values are output in MB.
-S: only list the final sum of values.
Example:
Example 1: List the volume of directories and files under/root, in MB
$ Du-m
Example 2: calculate the total directory and file capacity under/home and output the total capacity here.
$ Du-S/home

Fdisk　　
Purpose: Split a hard disk
Usage: 1. Enter fdisk-L/dev/SDA on the console to observe the physical usage of the hard disk.
2. Enter fdisk/dev/SDA on the console to enter the split hard disk mode.
M: All commands are listed.
P shows the hard disk partition.
A. Set the hard disk boot zone.
N sets the new hard disk partition.
Enter the "e" hard drive as the [extended] partition (extend ).
Enter P hard drive as the [primary] partition (primary ).
T changes the partition property of the hard disk.
D. Delete the partition property of the hard disk.
Q ends and is not saved to the hard disk partition.
W ends and is written to the hard disk partition.

Example:

As mentioned above, the main task of fdisk is to modify the partition table without actually cutting the hard disk and then format it with mke2fs. It defines a partition from the N1 column to the N2 column. Therefore, if the hard disk partition is incorrect, you can recover the partition table before formatting.

Example 1: delete a partition: to delete an existing partition, you must:
1. $ fdisk/dev/HDB: Enter the fdisk interface first;

2. P: Check the partition information first. assume you want to delete/dev/hdb1;

3. D: select a partition. Select 1 here;
4. W: Save the modification to the disk data table and exit fdisk. What should I do if I regret it? Press the Q key to cancel the deletion operation.

Example 2: Add a partition: how to add a partition? The premise is that you still have space on your hard disk.
1. $ fdisk/dev/HDB: Enter the fdisk interface first;
2. N: Add a partition. If you already have an extended partition, the system will ask whether you want to add a primary partition or a logical partition. If you have not yet extended the partition, the system will ask you whether to add a primary partition or an extended partition. In addition, if you have used up 4 P + e, you can select only logical partitions. If you select the primary partition, press P; otherwise press E or L;
3. P: select the primary partition, so press p;
4. 1-4: only four primary partitions are allowed (it is much better than Windows to allow only one). Therefore, please press the number corresponding to the partition that has not been used;
5. W: Save and exit.