toddbluhm / env-cmd / 425

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Pull #103

travis-ci

feat: Support env vars expansion in cmd and args

This pull request adds support for expanding environment variable
expansion support. Closes #91

Since the user controls the call site of cmd-env, it only supports
basic UNIX style $var format. `%var%` (windows) or `${var}` is not
supported. However, you can escape variable expansion by escaping
the dollar sign like so `\$`.

Signed-off-by: omeid matten <public@omeid.me>

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