> For the complete documentation index, see [llms.txt](https://linux-tutorial-cli.gitbook.io/linux-cli-tutorial/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://linux-tutorial-cli.gitbook.io/linux-cli-tutorial/txt-files/reject.md).

# reject

## reject

The `reject` command in Linux is used to reject a connection from a remote host. It is a powerful command that can be used to protect your system from unauthorized access.

The `reject` command is used in the following format:

```
reject [options] [host]
```

The `options` are:

* `-a` : Reject all connections from the specified host.
* `-g` : Reject connections from the specified group of hosts.
* `-u` : Reject connections from the specified user.

The `host` is the hostname or IP address of the host to reject.

For example, to reject all connections from the host `192.168.1.100`, you would run the following command:

```
reject 192.168.1.100
```

To reject connections from the group of hosts `192.168.1.0/24`, you would run the following command:

```
reject -g 192.168.1.0/24
```

To reject connections from the user `root`, you would run the following command:

```
reject -u root
```

The `reject` command is a powerful tool that can be used to protect your system from unauthorized access. It is a simple command to use and is supported by most Linux distributions.

Here are some additional things to note about the `reject` command:

* The `reject` command can be used to reject connections from specific hosts or groups of hosts.
* The `reject` command can be used to reject connections from specific users.
* The `reject` command can be used to reject connections from all hosts.
* The `reject` command is a powerful tool that can be used to protect your system from unauthorized access.

## help

```
```