Learn how to check hard disk size in Ubuntu terminal. 5 useful commands to check hard disk space via Ubuntu command line. On Ubuntu, check disk space in GB using any of these commands.

Before we begin, let use see the GUI way to check disk space in Linux Ubuntu:

Check how much disk space is left on Ubuntu

You can check how much disk space is left with Disk Usage Analyzer or System Monitor.

Check with Disk Usage Analyzer

To check the free disk space and disk capacity using Disk Usage Analyzer:

  • Open Disk Usage Analyzer from the Activities overview. The window will display a list of file locations together with the usage and capacity of each.
  • Click one of the items in the list to view a detailed summary of the usage for that item. Click the menu button, and then Scan Folder… or Scan Remote Folder… to scan a different location.

The information is displayed according to Folder, Size, Contents and when the data was last Modified.

Check with System Monitor

To check the free disk space and disk capacity with System Monitor:

  1. Open the System Monitor application from the Activities overview.
  2. Select the File Systems tab to view the system’s partitions and disk space usage. The information is displayed according to Total, Free, Available and Used.

Check Disk Space In Ubuntu Terminal

The “df” command is for “disk filesystem” and is a great tool to know about the disk space usage on Linux Systems. The df command displays the amount of disk space available on the file system.

If no file name is given, the space available on all currently mounted file systems is shown. Disk space is shown in 1K blocks by default, unless the environment variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.

If an argument is the absolute file name of a disk device node containing a mounted file system, df shows the space available on that file system rather than on the file system containing the device node (which is always the root file system).

Example-1:

The simplest df command is by itself. Without any command parameters. When executed the df command displays the information about the file system disk space usage. It shows the device name, total blocks, total disk space, used disk space, free disk space and mount points.
df

Example-2:

Using the df command with -a or –all it shows dummy file systems information along
 with all the basic file system disk usage info:

df -a

Example-3:

As the disk space is shown in 1K blocks by default, users can use “-h”
 command parameter to show the file system disk space usage data in 
“human readable” format.

df -h

Example-4:

Use the command parameters -hT to display the info about the /home file system:

df -hT /home

Example-5:

Use the command argument -k to display all file system information in 
1024-byte blocks:

df -k

Example-6:

Similarly you can use the command argument -m to display all file 
system information in MB (Mega Byte) and -h to see the info in GB (Gigabyte):

df -m
df -h

Example-7:

If you wish to see the disk space usage info of a certain file system type, 
use it as argument:

df -t ext3

Similarly there are many more command arguments that can be used to see the desired info.

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