nb

nb [arguments]

It appears there's no standard, widely distributed Linux command called `nb`.
It's possible `nb` is:
1. A custom script or alias created by the user or system administrator.
2. A command available only in a specific software package that is not commonly installed.
3. A typo.
To determine what `nb` does on a specific system, one would need to examine the user's `.bashrc`, `.zshrc`, or other shell configuration files for aliases or function definitions. One could also search the system's `/usr/local/bin`, `/usr/bin`, `/usr/sbin` directories for executable files named `nb`.
If `nb` is a script, viewing its content with `cat nb` after locating the script in one of the bin directories will show the usage and meaning of the script.

Without knowing the specific implementation of `nb`, it's impossible to provide accurate details about its parameters, usage, or potential side effects.

If you're encountering issues with `nb`, try the following:
1. Verify that the command is defined as an alias or function. Use `alias` to see defined aliases and `declare -f` to see defined functions.
2. Check your shell configuration files (e.g., `.bashrc`, `.zshrc`) for definitions related to `nb`.
3. If `nb` is a script, ensure it has execute permissions (`chmod +x nb`).
4. Make sure the script is in a directory included in your `PATH` environment variable.

alias(1), function(1), bash(1), zsh(1)