[K12OSN] OT: check case and format of filename

Nils Breunese nils at breun.nl
Fri Sep 26 17:12:08 UTC 2008

Rob Owens wrote:

> Since list has been kinda slow lately, I'll test your patience with  
> one
> more scripting question.  You guys have really helped me learn a lot  
> in
> the past couple of days.  I've been looking into bash parameter
> expansion, awk, and sed, but I'm not really sure I'm going in the  
> right
> direction.
> I need to check a filename for a particular "format" or "convention".
> File names should look like this:
> AB12D89-S123--revA
> AB12D89-S123--revA--page1
> In other words:
> 1)  They should be all uppercase and numeric before the '--'
> 2)  They must contain '--revX', where X is any uppercase letter, and
> 'rev' must be lowercase.
> 3)  There is an optional --page# at the end, where # is any number,  
> and
> 'page' must be lowercase.
> I can work out the logic of testing for compliance with my rules, but
> I'm not sure how to identify the case of each letter, nor how to split
> the filename up using '--' as the divider.
> Thanks for any advice you might have.  By the way, this is to be  
> part of
> a bash script (which is to be run on my K12LTSP box).

Do you need a function that returns true or false depending on whether  
a string (filename) complies with the format or do you need something  
that returns all filenames in a directory that do or do not comply or  
something? Did you already figure out that you're probably looking at  
using regular expressions? http://www.regular-expressions.info/ has a  
lot of info on regular expressions.

Hm, this is starting to feel like work. This is your last free  
question, next time I'll send you an invoice. :o)

Nils Breunese.

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