Convert 'a' to 'A' in a Shell-Script

[Diana Koehler]

How can I convert "lowercase" characters in "uppercase" characters
in a Shell-Script.
f.e. convert all 'a' to 'A' ?
(awk, sed ??)

Thanks in advance

Diana

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Diana Koehler                     Tel.:   +49 7721 867034
Kienzle Computersysteme
Abt. 011.2                        e-mail: koe at kivax.UUCP
Postfach 1640                             ..!mcsun!unido!kivax!koe
D-7730 VS-Villingen                       ..!uunet!unido!kivax!koe