in reply to The most useless key on my keyboard is:

There's a key in the top-left, next to the 1, that has three symbols on it, ` and |, and I don't know how to make it procude a |. I don't use ` and as to what a is, I have no idea. The only time I've ever pressed it is to see what it does.
UK keyboard
Oh, hang on, I do use ` occasionally if I'm using a unix shell, so maybe it is useful, but not to a Windows-type like me.

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Re: UK keyboard answer
by BrowserUk (Pope) on Nov 29, 2005 at 18:03 UTC

    Alt-gr (the right-hand Alt key) + that key will produce the "broken-bar" symbol ''.

    '' is known in some circles, predominantly the APL crowd as the 'not' symbol. It can also be used as not in REXX if a = 'this' then if memory serves.

    As for '`', I've often wished that the back-ticks use of this could be relinguished in favour of qx[] so that it could then be utilised for something else.

    Eg. some of the inconsistancies with {} being interpreted as anonymous hashes instead of blocks could be done away with if a hash used backticks. $hash`key`. It would also do away with the need for double delimiters where the key contains spaces and other similar characters: $hash{'another key'} or

    $hashref = `key1 => value1, key2 => value2`;

    Though it would require both '`' and '=' to be escaped if part of a key.

    Perl 6 has gone for %hash<<key>>, which for is okay, but still requires "double delimiters" for non-unicode typing or at least double keystrokes for those set up for unicode compositing.

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