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In this video,
we'll talk about tr.

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TR is for translate. It translates sets
of characters into other sets of characters.

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It's useful for converting upper into
lowercase or the other way around.

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And here are a couple of examples
which I'm just going to run for you.

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So let's start by using echo hello, which normally
is printing the text hello on the screen. And.

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And now I'm sending it to
TR to translate lowercase into uppercase.

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And there we
can see uppercase hello.

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Now, lower to upper
is much nicer than

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the alternative, which is
az, a colon Z.

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Because this would only work in languages
where you don't have special accents on

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your letters, like umlaut in German, like
CD in French and stuff like that.

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That doesn't work if you just
go for plain az uppercase az.

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Now another one that
is kind of funny.

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If we look for am and we
translate by nz, then here you go,

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you can see that it has
changed some of the characters in there.

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That's what
TR can do.

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I like TR a lot because
it allows you to convert into

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all lowercase, which makes scripted
operations a lot easier. For instance.