bash - how to uppercase the command line argument?

Question

I searched SO and found that to uppercase a string following would work

str="Some string"
echo ${str^^}

But I tried to do a similar thing on a command-line argument, which gave me the following error

Tried

#!/bin/bash
             ## Output
echo ${1^^}  ## line 3: ${1^^}: bad substitution
echo {$1^^}  ## No error, but output was still smaller case i.e. no effect

Please let me know, how could we do this?

Answer 1

The syntax(str^^) which you are trying is available from Bash 4.0 and above. Perhaps, yours is a older version:

Try this:

str="Some string"
echo $str | awk '{print toupper($0)}'

Guru.