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simon2000, the solution that you posted seems so far off the mark that I'm really sure what to say about it. First, out of the blue you are testing the value of a variable called X. Where did X...

The # says to remove a leading pattern. The ? is a pattern that matches a single character. Put them together and you are stripping off the first character.

Well in ksh (why do people NEVER reveal which language they are using?) it is easy:
#! /usr/bin/ksh
x=_1234567.RP
y=${x#?}
echo $y
exit 0