ghci configuration file

Have you tried adding :set prompt "ghci> " to ~/.ghci?

In my ~/.ghci configuration file. I have the following line:

:set prompt "\ESC[0;34m\STX%s\n\ESC[1;31m\STXλ> \ESC[m\STX"

And here is how my ghci prompt looks like:

https://asciinema.org/a/Tpk5430dPqCRN0cFqi1ucaCb8

In that config file, I temporarily commented out :set +m.

Having applied @hvr's answer I got the following warning:

*** WARNING: ~/.ghci is writable by someone else, IGNORING!

The solution is chmod g-w ~/.ghci.

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