.TH NL 1 sbase\-VERSION .SH NAME sort \- sort lines .SH SYNOPSIS .B sort .RB [ \-nru ] .RI [ file ...] .SH DESCRIPTION .B sort writes the sorted concatenation of the given files to stdout. If no file is given, sort reads from stdin. .SH OPTIONS .TP .B \-n perform a numeric sort. .TP .B \-r reverses the sort. .TP .B \-u prints repeated lines only once.