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+.Dd October 26, 2020
+.Dt SDN 1
+.Os Linux
+.Sh NAME
+.Nm sdn
+.Nd simple directory navigator
+.Sh SYNOPSIS
+.Nm sdn
+.Op Ar line Ar point
+.Sh DESCRIPTION
+.Nm
+is a simple directory navigator that you can invoke while editing shell
+commands.  Use the
+.Xr sdn-install 1
+script to integrate it with your shell, then invoke it with M-o.
+.Sh ENVIRONMENT
+.Bl -tag -width 15n
+.It Ev LS_COLORS
+Used to retrieve filename colours.  The format is described in
+.Xr dir_colors 5
+and you can use the
+.Xr dircolors 1
+utility to initialize this variable.
+.It Ev PAGER
+The viewer program to be launched by the F3 key binding as well as to show
+the internal help message.
+.It Ev VISUAL , Ev EDITOR
+The editor program to be launched by the F4 key binding.
+.El
+.Sh FILES
+.Bl -tag -width 25n -compact
+.It Pa ~/.config/sdn/config
+Program configuration and state.
+.It Pa ~/.config/sdn/bindings
+Key binding overrides.
+.It Pa ~/.config/sdn/look
+Redefine terminal attributes for UI elements.
+.El