rust toolchain cleaner

About

This small program deletes all installed rust toolchains except channels:

1. beta
2. stable
3. nightly
4. unstable

Requirements

1. rustup toolchain installer.

Arguments

1. -h print help message and exit
2. -v print version number and exit
3. -l list installed rust toolchains
4. -n do not delete any installed rust toolchains

Default action is to delete installed old rust toolchains.

License

This is free and unencumbered software released into the public domain.

This code can be used under terms of CC0 or the Unlicense.