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+.Dd January 14, 2019
+.Dt CASH 7
+.Os "Causal Agency"
+.
+.Sh NAME
+.Nm cash
+.Nd the Causal Agency shell
+.
+.Sh DESCRIPTION
+.Nm
+is a shell derived from
+.Fx
+.Xr sh 1 ,
+which is in turn derived from Almquist shell.
+It includes
+.Xr editline 3
+from
+.Nx .
+.
+.Ss Differences from Xr sh 1
+.Bl -bullet
+.It
+.Va ENV
+defaults to
+.Ql ${XDG_CONFIG_HOME:-${HOME}/.config}/cash/env.sh .
+.
+.It
+.Va PS0
+is printed before each prompt,
+allowing multi-line prompts.
+.
+.It
+Right-aligned prompts can be set with
+.Va RPS1
+and
+.Va RPS2 .
+.
+.It
+.Va PSlit
+can be used to embed terminal escape sequences in prompts,
+as in
+.Nx
+.Xr sh 1 .
+.
+.It
+.Va HOME
+is shortened to
+.Sq ~
+in prompt expansion.
+.
+.It
+.Ic fc Fl s Ar = Ns Ar new
+allows prefixing commands with
+.Ar new .
+.El
+.
+.Sh HISTORY
+.Xr sh 1
+sources were imported from
+.Fx 12.0 .
+.Xr editline 3
+sources were imported from
+.Nx 8.0 .