df (abbreviation for disk free) is a standard Unix command used to display the amount of available disk space for file systems on which the invoking user has appropriate read access. df is typically implemented using the statfs or statvfs system calls.
What is df command in Linux?
The df command (short for disk free), is used to display information related to file systems about total space and available space. If no file name is given, it displays the space available on all currently mounted file systems.
What is df command do?
Use the df command to display information about total space and available space on a file system. … If a file or directory is specified, then the df command displays information for the file system on which it resides. Normally, the df command uses free counts contained in the superblock.
How read df file in Linux?
To view disk space usage run the df command. This will print a table of information to standard output. This can be useful to discover the amount of free space available on a system or filesystems. Use% – the percentage that the filesystem is in use.
How does Linux df work?
The df command is used to show the amount of disk space that is free on file systems. In the examples, df is first called with no arguments. This default action is to display used and free file space in blocks. In this particular case, th block size is 1024 bytes as is indicated in the output.
What is the difference between df and du?
df vs. du. … The (very complicated) answer can be best summarized like this: The df command provides a sweeping ballpark figure for how much space is being utilized on your filesystem as a whole. The du command is a much more accurate snapshot of a given directory or subdirectory.
What is output of df?
Use the df command to show the amount of free disk space on each mounted disk. The usable disk space that is reported by df reflects only 90 percent of full capacity, as the reporting statistics leave 10 percent above the total available space. This head room normally stays empty for better performance.
How do I calculate disk space using df?
Linux check disk space with df command
- Open the terminal and type the following command to check disk space.
- The basic syntax for df is: df [options] [devices] Type:
- df.
- df -H.
What is df showing?
df shows the amount of free space left on a disk device, and the total amount available on the device (free+used). It measures space in units of 512-byte disk sectors.
How do I know if swap is enabled?
Easy, graphical way to check with Disk Utility
- Open Disk Utility from the Dash:
- In the left column, look for the words “Hard Disk”, and click on that:
- In the right column, see if you can find “Swap” as shown. If so, you have swap enabled; you can click on that portion to see details. It will look something like this:
How do you release a memory swap?
To clear the swap memory on your system, you simply need to cycle off the swap. This moves all data from swap memory back into RAM. It also means that you need to be sure you have the RAM to support this operation. An easy way to do this is to run ‘free -m’ to see what is being used in swap and in RAM.
How do you stop swap?
In simple ways or the other step:
- Run swapoff -a: this will immediately disable the swap.
- Remove any swap entry from /etc/fstab.
- Get the system rebooted. Ok, if the swap is gone. …
- Repeat steps 1 and 2 and, after that, use fdisk or parted to delete the (now unused) swap partition.