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Task/Unix-ls/Forth/unix-ls-1.fth

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+256 buffer: filename-buf
+: each-filename { xt -- }  \ xt-consuming variant
+  s" ." open-dir throw { d }
+  begin filename-buf 256 d read-dir throw while
+    filename-buf swap xt execute
+  repeat  d close-dir throw ;
+
+\ immediate variant
+: each-filename[  s" ." postpone sliteral ]] open-dir throw >r begin filename-buf 256 r@ read-dir throw while filename-buf swap [[ ; immediate compile-only
+: ]each-filename  ]] repeat drop r> close-dir throw [[ ; immediate compile-only
+
+: ls ( -- )  [: cr type ;] each-filename ;

Task/Unix-ls/Forth/unix-ls-2.fth

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+: save-string ( c-addr u -- a )
+  dup 1+ allocate throw dup >r place r> ;
+
+require ffl/car.fs
+: sorted-filenames ( -- car )
+  0 car-new { a }
+  [: swap count rot count compare ;] a car-compare!
+  each-filename[ save-string a car-insert-sorted ]each-filename
+  a ;
+
+: each-sorted-filename ( xt -- )
+  sorted-filenames { a }  a car-execute  [: free throw ;] a car-execute  a car-free ;
+
+: ls ( -- )
+  [: count cr type ;] each-sorted-filename ;