How to capitalize first letter of every word using sed in OSX

Question

I'm trying to capitalize the first letter of every word in a string using the following sed command, but it's not working:

 echo "my string" | sed 's/\b\(.\)/\u\1/g'

Output:

 my string

What am I doing wrong?

Thank you

Answer 1

Given your sample input, this will work in any awk:

$ echo 'my string' | awk '{for (i=1;i<=NF;i++) $i=toupper(substr($i,1,1)) substr($i,2)} 1'
My String

If that doesn't do what you really want then edit your question to show some more truly representative sample input and expected output.