Bug: Unable to set a multi-line environment variable with age

[Dremora]

It’s currently not possible to set a multi-line environment variable (e.g., an SSH private key) when using age. (I haven't tried without age).

When providing the value directly (via CLI argument or prompt), newlines are not handled correctly.

Steps to Reproduce

Case 1: Direct string with \n

mise env set --age-encrypt MY_KEY "-----BEGIN PRIVATE KEY-----\nabc\n-----END PRIVATE KEY-----"

Result:
The value is stored literally with \n sequences instead of actual newlines.

Case 2: --prompt with literal newlines

mise env set --age-encrypt MY_KEY --prompt
# Paste the full key with real line breaks

Result:
Only the first line of input is stored; the rest is discarded.

Case 3: --prompt with escaped \n

mise env set --age-encrypt MY_KEY --prompt
# Paste: -----BEGIN PRIVATE KEY-----\nabc\n-----END PRIVATE KEY-----

Result:
The \n sequences are preserved literally, not converted to newlines.

Expected Behavior

Mise should correctly handle multi-line input and preserve actual newline characters in the environment variable value—whether input is provided as a direct argument, through --prompt, or includes escaped \n sequences.

Environment

• Mise version: 2025.11.1
• OS: macOS 26.0.1

[davekaro]

I had this same problem. I was able to work around it by creating a file with the contents of the private key, then using cat when setting the value like:

mise env set --age-encrypt MY_KEY="$(cat private.key)"