Linux / Unix - Checking Free Disk Space

To check the free disk space on a Linux or Unix system, you can use the df command. The df command is a utility that displays information about the available and used disk space on a file system.

To check the free disk space on your system, open a terminal and enter the following command:

df -h

The -h option tells the df command to display the sizes of the file systems in "human-readable" format, which means that the sizes are displayed in a more convenient format, such as in megabytes (MB) or gigabytes (GB).

The output of the df command will show the name of each file system, the total size of the file system, the amount of space that is used, and the amount of space that is available. For example, the output might look something like this:

Filesystem      Size  Used Avail Use% Mounted on
/dev/sda1       9.8G  2.6G  6.8G  28% /
/dev/sdb1       1.8T  1.2T  647G  65% /mnt/backup

To check the free disk space on a specific file system, you can specify the file system as an argument to the df command. For example, to check the free disk space on the / file system, you can use the following command:

df -h /

This will display information about the / file system, including the total size, used space, and available space.

Keep in mind that the df command only shows information about mounted file systems. If you want to check the free space on a file system that is not mounted, you will need to mount it first before running the df command.