Those commands do not work at linux command lines. They are for the search box only. You need the backtick (`). Be sure to NOT use a single quote (') like you showed above.
On the DX and DXG, the backtick (`) is on the far right of the second SYM row, immediately left of the tilde (~). The single quote (') is the 2nd char on the top row -- do NOT use it.
Version 3 kindles (e.g. kindle keyboard) use a tilde (~) instead of a backtick (`).
Last edited by geekmaster; 12-14-2011 at 08:45 PM.