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[PavelR]

Kdysi davno jsem resil podobny problem. Snazsi nez sed je pouziti tr, viz
kousek manualu:

 A  common  use of tr is to convert lowercase characters to
 uppercase.  This can be done in many ways.  Here are three
 of them:
               tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ
               tr a-z A-Z
               tr '[:lower:]' '[:upper:]'

 Zkousel jsem treti variantu a funguje i pro ceske znaky.

 Pavel Roj