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How much space do I have free on my Linux drive?
Cat Command to Show Linux Memory Information Entering cat /proc/meminfo in your terminal opens the /proc/meminfo file. This is a virtual file that reports the amount of available and used memory. It contains real-time information about the system’s memory usage as well as the buffers and shared memory used by the kernel. Vmstat -s Displays the amount of memory used and available. Top top command displays all the currently running process in the system. This command displays the list of processes and thread currently being handled by the kernel. Top command can also be used to monitor the total amount of memory usage. Linux Check Memory Slots, baixar poker brasil online, slotsskills tj, mobile casino free bonuses.
Managing disk space on a Linux server is an important task. For example, package manager applications notify you how much disk space will be required for an installation. For that information to be meaningful, you should know how much space your system has available.
In this tutorial, learn how to use the df
command to check disk space in Linux and the du
command to display file system disk space usage.
- A Linux-based system
- A terminal window / command line
- A user account with sudo or root privileges
You can check your disk space simply by opening a terminal window and entering the following:
The df
command stands for disk free, and it shows you the amount of space taken up by different drives. By default, df
displays values in 1-kilobyte blocks.
You can display disk usage in a more human-readable format by adding the –h
option:
This displays the size in kilobytes (K), megabytes (M), and gigabytes (G).
The df
command lists several columns:
Your output may have more entries. The columns should be self-explanatory:
- Filesystem – This is the name of each particular drive. This includes physical hard drives, logical (partitioned) drives, and virtual or temporary drives.
- Size – The size of the filesystem.
- Used – Amount of space used on each filesystem.
- Avail – The amount of unused (free) space on the filesystem.
- Use% – Shows the percent of the disk used.
- Mounted on – This is the directory where the file system is located. This is also sometimes called a mount point.
The list of filesystems includes your physical hard drive, as well as virtual hard drives:
- /dev/sda2 – This is your physical hard drive. It may be listed as /sda1, /sda0, or you may even have more than one. /dev stands for device.
- udev – This is a virtual directory for the /dev directory. This is part of the Linux operating system.
- tmpfs – You may have several of these. These are used by /run and other Linux processes as temporary filesystems for running the operating system. For example, the tmpfs /run/lock is used to create lockfiles. These are the files that prevent multiple users from changing the same file at the same time.
The df
command can be used to display a specific file system:
You can also use a backslash:
This displays the usage on your primary hard drive. Use the mount point (in the Mounted on column) to specify the drive you want to check.
Note: The df
command only targets a full filesystem. Even if you specify an individual directory, df
will read the space of the whole drive.
To list all file systems by type, use the command:
This lists drives with the ext4
type, in human-readable format.
You can display disk usage in units of 1000 instead of 1024:
This can address a point of confusion in storage technology. Hard drive manufacturers sell hard drives in sizes based on 1000 bytes = 1 kilobyte.
However, operating systems divide that space up so that 1024 bytes = 1 kilobyte. Because of this, a 1000-gigabyte hard drive ends up with roughly 930 gigabytes of usable storage.
The du
command displays disk usage. This tool can display disk usage for individual directories in Linux, giving you a finer-grained view of your disk usage. Use it to display the amount of space used by your current directory:
Like the df
command, you can make du
human-readable:
It displays a list of the contents of the current directory, and how much space they’re using. You can simplify the display with the –s
option:
This shows how much space the current directory uses.
To specify the directory or file, check use the following options:
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With the second command, you may have noticed a permission denied error message. This means the current user doesn’t have the privileges to access certain directories. Use the sudo
command to elevate your privileges:
Note: If you’re working on CentOS Linux, you may need to use the su
command to switch to the root user to access protected directories.
You should now understand how to use df
and du
commands to check disk space on your Linux system. Remember, to display a complete list of options, use either df ––help
or du ––help
.
Check out our article on how to use fsck command to run a filesystem check as preventive maintenance or when there is an issue with your system.
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