.TH DF 1 ubase\-VERSION .OS Linux .SH NAME df \- show file system usage .SH SYNOPSIS .B df .RB [ \-ahsi ] .SH DESCRIPTION df displays the amount of disk space available on a file system. If no arguments are given, df shows all the file systems using 512-byte blocks. .SH OPTIONS .TP .BI \-a Show all file systems including dummy ones. .TP .BI \-h Not implemented. .TP .BI \-s Not implemented. .TP .BI \-i Not implemented.