How to Check and Clean a Linux System's Disk Space
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Linux provides several built-in commands for analyzing and cleaning up your system’s disk space. This guide shows you how to use those commands to get a closer look at your disk usage and start freeing up space.
How Do I Check Disk Space on Linux?
Linux systems have two commands readily available for checking your disk space. These commands provide a high-level view of your whole system’s available disk space and the disk usage within particular directories.
How to Check Linux Disk Space with the df Command
df command to view your system’s available disk space for each drive.
Filesystem 1K-blocks Used Available Use% Mounted on udev 4031204 0 4031204 0% /dev tmpfs 815276 952 814324 1% /run /dev/sda 164619468 3091188 153149572 2% / tmpfs 4076368 0 4076368 0% /dev/shm tmpfs 5120 0 5120 0% /run/lock tmpfs 4076368 0 4076368 0% /sys/fs/cgroup tmpfs 815272 0 815272 0% /run/user/1000
df command (short for “disk free”) shows each drive’s disk size, space used, and free space. Each “block” in the above output represents one kilobyte.
To make the output from
df easier to read, you can add the
-h option. This option displays disk space in kilobytes (K), megabytes (M), and gigabytes (G).
sudo df -h
Filesystem Size Used Avail Use% Mounted on udev 3.9G 0 3.9G 0% /dev tmpfs 797M 952K 796M 1% /run /dev/sda 157G 3.0G 147G 2% / tmpfs 3.9G 0 3.9G 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup tmpfs 797M 0 797M 0% /run/user/1000
You can also use the
df command to target a specific drive, using either its “Filesystem” or “Mounted on” description from the columns above.
sudo df -h /dev/sda
Filesystem Size Used Avail Use% Mounted on /dev/sda 157G 3.0G 147G 2% /
The above command is equivalent to
sudo df -h /.
How to Check Linux Disk Space with the du Command
du command to analyze disk space at a more granular level. This command summarizes the space usage for a specified directory or the current directory if none is specified.
sudo du /etc/systemd
4 /etc/systemd/system/sockets.target.wants 4 /etc/systemd/system/sysinit.target.wants 4 /etc/systemd/system/timers.target.wants 4 /etc/systemd/system/multi-user.target.wants 100 /etc/systemd/system 16 /etc/systemd/network 4 /etc/systemd/user/sockets.target.wants 8 /etc/systemd/user 164 /etc/systemd
du command lists all of the files and directories in the target directory and displays their disk usage in kilobytes.
The last entry in the list is always the target directory itself, giving you a summary of the directory’s disk usage. You can isolate disk space information for the target directory by using the
-s option. This is a useful option for directories with many files and subdirectories.
sudo du -s /
As with the
df command, you can make the output easier to read with the
-h option. This causes the disk space to be displayed in kilobytes (K), megabytes (M), and gigabytes (G). In the example below, the
-h option is used in combination with the
sudo du -sh /etc
How Do I Clean Disk Space on Linux?
You may need to clean your disk space on Linux because you need space to install additional software. Another reason may be that you received a warning that your system’s disk space is critically low. It is likely that at some point you may need to free up disk space on your Linux system.
The best place to start is usually with your Linux package manager. Each package manager offers options to quickly and easily clear out space from unused or unnecessary packages and related data.
How to Remove Unnecessary Packages
Most major package managers include an
autoremove command. This command automatically removes packages that are no longer in use. These packages are typically ones that were originally installed as dependencies for other packages.
With Debian and Ubuntu distributions, you can use APT’s version of the command:
sudo apt autoremove
Likewise, on AlmaLinux and CentOS, you can use the command with
sudo yum autoremove
And the same applies to Fedora’s DNF package manager:
sudo dnf autoremove
How to Clear the Package Cache
Linux package managers generally also include a
clean command. This command clears the cache used by the package manager. It can also be a helpful command if you are having package errors due to corrupted metadata.
For Debian and Ubuntu, use the command below.
sudo apt clean
APT also has an
autoclean command. This command clears the cache for outdated packages that can no longer be downloaded from APT’s repositories.
sudo apt autoclean
Both YUM and DNF require you to specify what you want to be cleared from the cache. The most helpful options are
all. As an example, here is the YUM command for clearing all of the cached data.
sudo yum clean all
How to List and Remove Unwanted Packages
If you still need space, you may want to look at your installed packages and start deciding which ones you no longer need.
List the packages you have installed.
For Debian and Ubuntu, use the
sudo apt list --installed
For AlmaLinux and CentOS, use the below
sudo yum list installed
On Fedora, the command is similar to the YUM command; simply replace
Uninstall each package that you no longer need or want on your system. In the following examples, replace
nginxwith the name of the package to be removed.
Uninstall a package with the
sudo apt remove nginx
Uninstall a package with the
sudo yum remove nginx
Uninstall a package with the
sudo dnf remove nginx
NoteBefore removing packages, ensure that they are not required by the system. Usually, you can safely remove packages that you installed, but be cautious of removing packages that you do not recognize.
Still looking for more disk space? You may want to think about getting additional space for your Linux system. You can follow our Resizing a Linode guide to learn how to increase your Linode’s plan size.
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