uppercase first character in a variable with bash

Question

I want to uppercase just the first character in my string with bash.

foo=\"bar\";

//uppercase first character

echo $foo;

should print \"B

Answer 1

This works too...

FooBar=baz

echo ${FooBar^^${FooBar:0:1}}

=> Baz

FooBar=baz

echo ${FooBar^^${FooBar:1:1}}

=> bAz

FooBar=baz

echo ${FooBar^^${FooBar:2:2}}

=> baZ

And so on.

Sources:

• Bash Manual: Shell Parameter Expansion
• Full Bash Guide: Parameters
• Bash Hacker's Wiki Parameter Expansion

Inroductions/Tutorials:

• Cyberciti.biz: 8. Convert to upper to lower case or vice versa
• Opensource.com: An introduction to parameter expansion in Bash