df Command in linux/Unix

Usage

Report how much free disk space is available for each mount you have.

Syntax :

df  [option]  Mountpoint

Genarally used options

-k        like –block-size=1K

-h,    –human-readable  print sizes in human readable format( GB’s)
-i,         inode information instead of block usage

Examples:

To Find Amount of Free Space in  All Mount points

Some of examples
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df -h
df -k
df -h mountpoint
df -i