diff --git a/shell/src/ascii_box.rs b/nested/src/ascii_box.rs
similarity index 100%
rename from shell/src/ascii_box.rs
rename to nested/src/ascii_box.rs
diff --git a/shell/src/monstera.rs b/nested/src/monstera.rs
similarity index 100%
rename from shell/src/monstera.rs
rename to nested/src/monstera.rs
diff --git a/shell/src/plot.rs b/nested/src/plot.rs
similarity index 100%
rename from shell/src/plot.rs
rename to nested/src/plot.rs
diff --git a/shell/gram2 b/shell/gram2
new file mode 100644
index 0000000..7cae647
--- /dev/null
+++ b/shell/gram2
@@ -0,0 +1,93 @@
+
+‹ShellTerm› :=
+    | Lit : "«String»" | "«Path»~«Sep Char '/'»~«Seq Char»~«TerminatedArray AsciiChar~Byte 0»"
+    | Var : $«ProcessArgument~ℕ~«PositionalInt 10 BigEndian»»
+    | Sub : $(«Process»)
+
+$PATH:›Sequence Path‹
+     :›SeparatedSequence Char '/' ‹
+     :›Sequence ›Sequence Char‹‹
+     :›‹
+     :‹SeparatedSequence Char ':'‹
+     :‹Sequence Char›
+     &‹OsString~›
+     ~‹List Char~Vec Byte›
+
+Seq
+Vec
+Sep
+read :: Sep -> Seq
+read (Sep xs) d -> 
+deco :: Style -> Seq  -> 
+
+ShellTerm::eval t:‹ShellTerm› -> ‹String› {
+    match t {
+        ShellTerm::Lit "s:«String»" -> {
+	    
+        }
+	ShellTerm::Var var:$
+    }
+}
+
+$PATH : ‹Sequence Path› ~ ‹SeparatedSequence Char ':'›
+
+ShellTerm::eval := «» -> «»
+«Path» :> «»
+
+‹Path› := [ PathSegment ] ~ ‹List ›
+
+[Char]
+  :separator '/'
+  :
+
+‹ a: Int x b: Int ›
+( a b )
+
+
+
+// Process is a Structure Type
+‹Process› := {
+    env   : ‹ Symbol -> ShellTerm ›
+    exe   : ‹ Path ›
+    args  : ‹ [ShellTerm] ›
+    stdin : ‹ Pipe ›
+}
+
+
+
+// OsString is an Abstraction Type
+[OsString] := [Sequence AsciiChar] ~ [Sequence Byte] ~ [TerminatedSequence Byte 0] ~ [Pointer Byte] ~ [MachineWord]
+
+execve := {
+    ‹ Process
+    ~ { env : Symbol, exe: Path~,  } ›
+    ->
+}
+
+precedence of operators: '~' < ':' < '[ ]' < '{ }'
+
+<Ls> := [ < ]
+
+
+
+‹Process exe=/bin/ls› : ‹Process› := {
+    args : ‹ [ProcessArgument] ~ []
+}
+
+	:> «PosixShellScript ~ String» { ... }
+        :> «TerminalView» { ... }
+
+
+»ProcessId«~»MachineInt«~»MachineWord«~»Register«
+«ProcessId»~«MachineInt»~«MachineWord»~«Register»
+
+Pipe::read = {
+    fd: const ( FileDescriptor ~ MachineInt ~ Register ~ EAX )
+    buf: ( Array Byte ~  )
+} -> 
+
+stdout := «ProcessId» -> «FileDescriptor»~«MachineInt»~«Register»~«EAX»
+
+
+poorly-written shell scripts often do not handle filenames with spaces.
+
diff --git a/shell/grammar b/shell/grammar
new file mode 100644
index 0000000..e47a070
--- /dev/null
+++ b/shell/grammar
@@ -0,0 +1,10 @@
+
+ls :: [files]:<Set Path>
+      [options]:<Set String>
+
+: (view ls) (template
+(decorate files EnumSet)
+
+((λx.xx) a) = aa
+
+-> (process files.to_seq.(map |x|{   }) )
diff --git a/shell/src/expr.rs b/shell/src/expr.rs
deleted file mode 100644
index c154a87..0000000
--- a/shell/src/expr.rs
+++ /dev/null
@@ -1,28 +0,0 @@
-use {
-    std::{
-        sync::{Arc, RwLock}
-    }
-    nested::{
-        core::TypeTerm,
-    }
-};
-
-struct ExprEditor {
-    editor: Arc<RwLock<dyn TerminalTreeEditor>>,
-    type_tag: TypeTerm
-}
-
-impl TreeNav for ExprEditor {
-    
-}
-
-impl TerminalEditor for ExprEditor {
-    fn get_term_view(&self) -> OuterViewPort<dyn TerminalView> {
-        
-    }
-
-    fn handle_terminal_event(&mut self, event: &TerminalEvent) -> TerminalEditorResult {
-        
-    }
-}
-
diff --git a/shell/src/main.rs b/shell/src/main.rs
index 05d9eac..0cf823e 100644
--- a/shell/src/main.rs
+++ b/shell/src/main.rs
@@ -1,11 +1,10 @@
 extern crate portable_pty;
 
-mod ascii_box;
-mod monstera;
-//mod process;
 mod pty;
+
+// TODO rewrite process & command with incubator rules
+//mod process;
 //mod command;
-mod plot;
 
 use {
     cgmath::{Point2, Vector2},
diff --git a/shell/src/process.rs b/shell/src/process.rs
index 9f6d3f5..a25f1fc 100644
--- a/shell/src/process.rs
+++ b/shell/src/process.rs
@@ -21,7 +21,7 @@ use {
 };
 
 //<<<<>>>><<>><><<>><<<*>>><<>><><<>><<<<>>>>
-/*
+
 pub struct ProcessArg {
     editor:
         PTYListEditor<CharEditor>,
@@ -274,4 +274,4 @@ impl Diagnostics for ProcessLauncher {
 }
 
 impl Nested for ProcessLauncher {}
-*/
+