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You can change the case of the whole string with ^^ (upper) like or ,, (minor), and the case of the first character with ^ or , like this :

root@messagerie[10.10.10.19] ~/SCRIPTS/MAIL # s=pascal 
root@messagerie[10.10.10.19] ~/SCRIPTS/MAIL # echo ${s^^}                                                                                                                                                                           
PASCAL                                                                                                                                                                                                                                       
root@messagerie[10.10.10.19] ~/SCRIPTS/MAIL # echo ${s^}                                                                                                                                                                                    
Pascal                                                                                                                                                                                                                                       
root@messagerie[10.10.10.19] ~/SCRIPTS/MAIL #  

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