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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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