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Reverse |.  _ 1 _ Rotate

|. y reverses the order of the items of y . For example:
   |. t=: 'abcdefg'
gfedcba
The right shift is the dyadic case of |.!.f with the left argument _1 . For example:
   |.!.'#' t
#abcdef
    
   |.!.10 i.3 3
10 10 10
 0  1  2
 3  4  5
  x|.y rotates successive axes of y by successive elements of x . Thus: 
   1 2 |. i. 3 5
 7  8  9  5  6
12 13 14 10 11
 2  3  4  0  1
The phrase x |.!.f y produces a shift: the items normally brought around by the cyclic rotation are replaced by f unless f is empty (0=#f), in which case they are replaced by the normal fill defined under {. (take):
   2 _2 |.!.'#'"0 1 t
cdefg##
##abcde


   y=: a.{~ (a. i. 'A') + i. 5 6

   (] ; 2&|. ; _2&|. ; 2&|."1  ; 2&(|.!.'*'"1)) y
+------+------+------+------+------+
|ABCDEF|MNOPQR|STUVWX|CDEFAB|CDEF**|
|GHIJKL|STUVWX|YZ[\]^|IJKLGH|IJKL**|
|MNOPQR|YZ[\]^|ABCDEF|OPQRMN|OPQR**|
|STUVWX|ABCDEF|GHIJKL|UVWXST|UVWX**|
|YZ[\]^|GHIJKL|MNOPQR|[\]^YZ|[\]^**|
+------+------+------+------+------+

   (] ; |. ; |."1 ; |.!.'*'"1  ; (2: |. ])) y
+------+------+------+------+------+
|ABCDEF|YZ[\]^|FEDCBA|*ABCDE|MNOPQR|
|GHIJKL|STUVWX|LKJIHG|*GHIJK|STUVWX|
|MNOPQR|MNOPQR|RQPONM|*MNOPQ|YZ[\]^|
|STUVWX|GHIJKL|XWVUTS|*STUVW|ABCDEF|
|YZ[\]^|ABCDEF|^]\[ZY|*YZ[\]|GHIJKL|
+------+------+------+------+------+

   1 _2 |. !. '*' 3{. y
**GHIJ
**MNOP
******


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