Though not directly Linux related, INTERCAL does run on Linux.

Exerpt:

"INTERCAL. The language designed to be Turing-complete but as fundamentally unlike any existing language as possible. Expressions that look like line noise. Control constructs that will make you gasp, make you laugh, and possibly make you hurl. Data structures? We don't need no steenking data structures!"

INTERCAL was originally developed in 1972 and lives on through the C-INTERCAL compiler. More information can be found at http://www.tuxedo.org/~esr/intercal/.

Rather than trying to describe the language, it's probably best to show an example. This one was written in Tri-INTERCAL: it merely counts to 10.

DO ,1 <- #16 DO :2 <- #6490$#55022 PLEASE DO (44) NEXT DO :2 <- #5631$#54733 PLEASE DO (44) NEXT DO :2 <- #14637$#40039 PLEASE DO (44) NEXT DO :2 <- #58550$#53112 PLEASE DO (44) NEXT DO .1 <- #1 PLEASE DO (99) NEXT DO GIVE UP

(44) DO REINSTATE COMING FROM (19) DO COME FROM (68)

DO ABSTAIN FROM (19)

(31) DO COME FROM (34)

DO ABSTAIN FROM (31)

(88) DO COME FROM (65)

PLEASE ABSTAIN FROM (88) DO COME FROM (44) PLEASE DO (123) NEXT DO .3 <- ':2"#4$#13"' DO :2 <- ':2"#29520$#29511"' DO ,1 SUB .1 <- .3

(65) DON'T GIVE UP (34) PLEASE DON'T GIVE UP (68) DO NOTE THAT THIS FUNNY CODE ACTUALLY WORKS

PLEASE RESUME #1

(99) DO COME FROM (69)

DO READ OUT ,1 DO ,1 SUB #1 <- #180 DO READ OUT .1 DO .2 <- "?.1$#10""#0$#29524" PLEASE DO (15) NEXT

(69) PLEASE DO (123) NEXT (42) DO RESUME .9 (123) PLEASE .8 <- #1

DO COME FROM (81) DO .9 <- '?"V!1.8'$#1"#1'#1 DO .1 <- "^.1$.8""#0$#29524" PLEASE DO (42) NEXT

(81) DO .8 <- !8$#0'"#9841$#1" (15) PLEASE RESUME '?"!2.2'#2"$#1'#1