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+CATSH(7)               Miscellaneous Information Manual               CATSH(7)
+
+NAME
+     catsh – a shell
+
+DESCRIPTION
+     catsh is a shell derived from FreeBSD sh(1), which is in turn derived
+     from Almquist shell.  It includes editline(3) from NetBSD.
+
+   Differences from sh(1)
+     •   ENV defaults to ‘${XDG_CONFIG_HOME:-${HOME}/.config}/catsh/env.sh’.
+
+     •   PS0 is printed before each prompt, allowing multi-line prompts.
+
+     •   Right-aligned prompts can be set with RPS1 and RPS2.
+
+     •   PSlit can be used to embed terminal escape sequences in prompts, as
+         in NetBSD sh(1).
+
+     •   HOME is shortened to ‘~’ in prompt expansion.
+
+     •   fc -s =new allows prefixing commands with new.
+
+HISTORY
+     sh(1) sources were imported from FreeBSD 12.0.  editline(3) sources were
+     imported from NetBSD 8.0.
+
+Causal Agency                  January 14, 2019                  Causal Agency