unix command grammar started

examples/unix/Unix.gf

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+abstract Unix = {
+
+  cat
+    S ;
+    Line ;
+    Command ;
+    File ;
+
+  fun
+    Pipe : Command -> S -> S ;
+    Comm : Command -> S ;
+
+    WhatTime   : Command ;
+    WhatDate   : Command ;
+    WhereNow   : Command ;
+    Remove : File -> Command ;
+    Copy   : File -> File -> Command ;
+    Linecount : File -> Command ;
+    Wordcount : File -> Command ;
+
+    Name : String -> File ;
+    It : File ;
+
+}

examples/unix/UnixEng.gf

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+--# -path=.:prelude
+
+concrete UnixEng of Unix = open Prelude in {
+
+  flags unlexer=textlit ; lexer=textlit ;
+
+{-
+  lincat
+    Line ;
+    [Command] {1} ;
+    Command ;
+    File ;
+-}
+
+  lin
+    Pipe = infixSS "then" ;
+    Comm c = c ;
+
+    WhatTime = ss ["what time is it"] ;
+    WhatDate = ss ["what date is it"] ;
+    WhereNow = ss ["where am I now"] ;
+    Remove = prefixSS "remove" ;
+    Copy x y = ss ("copy" ++ x.s ++ "to" ++ y.s) ;
+    Linecount = prefixSS ["how many lines has"] ;
+    Wordcount = prefixSS ["how many words has"] ;
+
+    Name x = x ;
+    It = ss "it" ;
+
+}

examples/unix/UnixUni.gf

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+--# -path=.:prelude
+
+concrete UnixUni of Unix = open Prelude in {
+
+  flags unlexer=codelit ; lexer=codelit ;
+
+{-
+  lincat
+    Line ;
+    [Command] {1} ;
+    Command ;
+    File ;
+-}
+
+  lin
+    Pipe = infixSS "|" ;
+    Comm c = c ;
+
+    WhatTime = ss ["date +%D"] ;
+    WhatDate = ss ["date +%T"] ;
+    WhereNow = ss ["pwd"] ;
+    Remove = prefixSS "rm" ;
+    Copy x y = ss ("cp" ++ x.s ++ y.s) ;
+    Linecount = prefixSS ["wc -l"] ;
+    Wordcount = prefixSS ["wc -w"] ;
+
+    Name x = x ;
+    It = ss [] ;
+
+}