How to substitute variable contents in a Windows batch file

Question

I\'m writing a simple script to substitute text in an environment variable with other text. The trouble I get is with the substituted or substituted text being pulled from o

Answer 1

The problem with:

echo %a:%c%=thin%

is that it tries to expand two variables: a: and =thin with a c constant string between them.

Try this:

echo echo ^%a:%c%=thin^% | cmd

The first command outputs:

echo %a:fat=thin%

which is piped into a second command shell for evaluation.