Usage Specification Example See also References External links Toggle External links subsection Manual pages df (Unix) 21 languages Article Talk Read Edit View history Tools From Wikipedia, the free encyclopedia df Example usage of df Original author(s) Ken Thompson , Dennis Ritchie ( AT&T Bell Laboratories ) Developer(s) Various open-source and commercial developers Initial release November 3, 1971 ; 52 years ago Operating system Unix , Unix-like Platform Cross-platform Type Command License coreutils : GPLv3+ df (abbreviation for d isk f ree ) 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 . History [ edit ] df for Unix-like systems is part of the X/Open Portability Guide since issue 2 of 1987. It was inherited into the first version of POSIX and the Single Unix Specification . [1]
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