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shellawkuppercase

Convert to uppercase in shell

I am reading a character from keyboard and converting it to uppercase and then displaying the character again.

But the following code produces an error:

read a;
a=echo $a | tr 'a-z' 'A-Z'
echo $a

I also tried this:

read option;
eval $(awk -v option=$option '{print "a="toupper(option);}')
echo $a
Solution

  • If you want to store the result of a back in a, then you can do use command substitution:

    read a;
a=$(echo $a | tr 'a-z' 'A-Z')
echo $a