First of all, glob expands the pattern according to shell conventions, so

glob "foob{a,b,c}r"
returns the list
('foobar', 'foobbr', 'foobcr')
just like bash would return 'foobar foobbr foobcr' expandig metacharacters

The x operator applied to a string repeats the string the specified number of times, so

"{a,b,c}" x 3 evaluates as "{a,b,c}{a,b,c}{a,b,c}"

When you feed this expression to glob, the result is a list of all the possible combinations of a, b and c in a string of three characters, from 'aaa' to 'ccc'.

This could be easily achieved through magical string autoincrement, but the beauty of this method (very nice, I love it!) is that it applies to any set of strings to combine, not just characters.

-- TMTOWTDI

In reply to Re: Re: Web-Safe Color Chart by trantor
in thread Web-Safe Color Chart by Zecho

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