Great Ones, I have a file with lines that look like this:

N7 some text 
N8 some more text
N9 more text
N10 and more text
N90 many lines of text
alot of text
N101 too much text
 text text
[download]

I need help with perl to renumber the lines above to look like this:

N1 some text 
N2 some more text
N3 more text
N4 and more text
N5 many lines of text
N6 alot of text
N7 too much text
N8 text text
[download]

I have alot of these files with 100's of lines in each one. This seems like it should be simple (for someone besides me!) Thanks for in advance for any offerings on this!

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