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  • \$\begingroup\$ The examples of more than two letters are not valid; the OP said that "the program must be valid after any circular shift". So, arj/jar is not valid, as there is no rja command (although I like this example). +1 for the script - really nice idea :) \$\endgroup\$ Commented Jun 23, 2012 at 21:17
  • \$\begingroup\$ Since I was unsure, and not a native English speaker, I consulted a dictionary, where I found it ambiguous, to either mean every, or to mean a random one. The example with shift left by 6, left by 1 and right by 10 assured me in the interpretation, that I just need to find a single shift possibility. \$\endgroup\$ Commented Jun 24, 2012 at 2:00
  • \$\begingroup\$ It is not ambiguous. If a program has to be valid after some random shift, then it must also be valid for every possible shift. \$\endgroup\$ Commented Jun 24, 2012 at 16:06
  • \$\begingroup\$ @Griffin: Okay - you wrote the question. I removed the longer examples; fortunately there are enough crptc abbrv prgnms in unix like gs and sg. :) Btw.: Are you a native Englisch speaker? In the sentence before, you wrote ... in any language ... - my solution only works in bash (and sh, zsh, ash and a few else), but all those other solutions take program names too. \$\endgroup\$ Commented Jun 24, 2012 at 20:19