How to use the df command in Linux
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.
df (GNU coreutils) 8.22 Copyright (C) 2013 Free Software Foundation, Inc.
The df command provides an option to display sizes in Human Readable formats by using '-h' (prints the results in human readable format (e.g., 1K 2M 3G)).
Filesystem Type Size Used Avail Use% Mounted on /dev/vda1 ext4 50G 17G 31G 35% / devtmpfs devtmpfs 485M 0 485M 0% /dev
The syntax for the df command is as follows:
Usage:
ls [OPTION]... [FILE]...
OPTIONS:
-a, --allinclude pseudo, duplicate, inaccessible file systems-B, --block-size=SIZEscale sizes by SIZE before printing them; e.g., '-BM' prints sizes in units of 1,048,576 bytes; see SIZE format below--directshow statistics for a file instead of mount point--totalproduce a grand total-h, --human-readableprint sizes in human readable format (e.g., 1K 234M 2G)-H, --silikewise, but use powers of 1000 not 1024-i, --inodeslist inode information instead of block usage-klike --block-size=1K-l, --locallimit listing to local file systems--no-syncdo not invoke sync before getting usage info (default)--output[=FIELD_LIST]use the output format defined by FIELD_LIST, or print all fields if FIELD_LIST is omitted.-P, --portabilityuse the POSIX output format--syncinvoke sync before getting usage info-t, --type=TYPElimit listing to file systems of type TYPE-T, --print-typeprint file system type-x, --exclude-type=TYPElimit listing to file systems not of type TYPE-v(ignored)--helpdisplay this help and exit--versionoutput version information and exit
Display values are in units of the first available SIZE from --block-size, and the DF_BLOCK_SIZE, BLOCK_SIZE and BLOCKSIZE environment variables. Otherwise, units default to 1024 bytes (or 512 if POSIXLY_CORRECT is set).
SIZE is an integer and optional unit (example: 10M is 10*1024*1024). Units are K, M, G, T, P, E, Z, Y (powers of 1024) or KB, MB, ... (powers of 1000).
FIELD_LIST is a comma-separated list of columns to be included. Valid field names are: 'source', 'fstype', 'itotal', 'iused', 'iavail', 'ipcent', 'size', 'used', 'avail', 'pcent', 'file' and 'target' (see info page).