What is df commands?
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.
How do I check disk usage in Solaris?
Use the df command to show the amount of free disk space on each mounted disk. Use the df -k command to display disk space information in Kbytes.
What is df command in bash?
The df command (short for disk free) is used to show the amount of free disk space available on Linux and other Unix-like systems and to understand the filesystems that have been mounted. df displays the amount of free space on the file system containing each file name argument.
What is df unit?
By default, df shows the disk space in 1 K blocks. df displays the values in the units of first available SIZE from –block-size (which is an option) and from the DF_BLOCK_SIZE, BLOCKSIZE AND BLOCK_SIZE environment variables. By default, units are set to 1024 bytes or 512 bytes(if POSIXLY_CORRECT is set) .
What is output of df?
df (disk free) command is used to display disk usage of the file system. By default df command shows the file system usage in 1K blocks for all the current mounted file system, if you want to display the output of df command in human readable format , use -h option like “df -h”.
Why is df used?
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 does df command work in Linux?
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 df output?
What does df stand for in physics?
In physics, the dissipation factor (DF) is a measure of loss-rate of energy of a mode of oscillation (mechanical, electrical, or electromechanical) in a dissipative system. It is the reciprocal of quality factor, which represents the “quality” or durability of oscillation.
Is df a byte?
The Single UNIX Specification specifications for df are: df [-k] [-P|-t] [-del] [file…] Use 1024-byte units, instead of the default 512-byte units, when writing space figures. Display in more easily human readable units such as KB, MB, GB or TB.
What is df command in Linux?
DESCRIPTION The df command displays the amount of disk space occupied by mounted or unmounted file systems, directories, or mounted resources, the amount of used and available space, and how much of the file system’s total capacity has been used. directoryrepresents a valid directory name.
What is the use of-help and-version in df command?
– -help : It displays a help message and exit. – -version : It displays version information and exit. 1. Using -a : If there is a need to display all file systems along with those which has zero block sizes then use -a option with df. 2. Using -h : This is used to make df command display the output in human-readable format.
What percentage of disk space is actually used by the df command?
The usabledisk space that is reported by dfreflects only 90 percent of full capacity, as the reporting statistics allows for 10 percent above the total available space. This head roomnormally stays empty for better performance. The percentage of disk space actually reported by the dfcommand is used space divided by usable space.
How to hide external NFS and Samba file systems from DF command?
Using -l : When we run df command then by default it shows any externally mounted file systems which include those from external NFS or Samba servers. We can hide the info of these external file systems from output with -l option syntax of which is shown below.