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It’s easy just use the tr command to lower, upper or capital case.

Here is an example…

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function toCapital
{
   for x in $*
   do
      echo -n ${x:0:1} | tr '[a-z]' '[A-Z]' | xargs echo -n
      echo -n ${x:1} | tr '[A-Z]' '[a-z]' | xargs echo -n
      echo -n " "
   done
}

To test the function just call it:

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toCapital yuCa aMigo

The output is:

Yuca Amigo

Hope it’s useful.