The man is a simples CLI sub-command from cargo, that helps you manage your Cargo.toml file.

To install the sub-command you just need to execute the following command:

cargo install cargo-man

To use the CLI you must inform the fields you want it to return or change using the flag --field or -f:

cargo man -f version
0.1.0

If you want to attribute a new value just use the flag --set or -s

cargo man -f version -s 1.0.0
1.0.0

By default, cargo-man looks at the package table, but you can change that by anything that you want it

cargo man -t dependencies -f something
1.0.0