Install the utility in Rescue

The Rescue recovery and diagnostic mode contains pre-installed diagnostic and recovery tools.

If you need additional tools, install their packages via the pacman package manager.

Packages can be installed:

from the official repository with additional Arch Linux tools;
AUR repository where users publish useful tools.

For your information

The tools are installed in RAM, so after a server reboot, all installed tools will be removed.

From the Arch Linux repository
From the AUR repository

Boot the server in Rescue recovery and diagnostic mode.
Mount the file system with the size extension of the cowspace partition intended for package downloads:
```
mount -t airootfs -o remount,size=4G /run/archiso/cowspace
```
Update the pacman package manager cache:
```
pacman -Syy
```
Install the package:
```
sudo pacman -S <package>
```
Specify <package> — package name. You can view the package name in the official Arch Linux repository.

An example of installing arcconf, a tool for managing a hardware RAID controller. Other tools from the AUR repository can be installed in the same way.

Boot the server in Rescue recovery and diagnostic mode.
Mount the file system with the size extension of the cowspace partition intended for package downloads:
```
mount -t airootfs -o remount,size=4G /run/archiso/cowspace
```
Install the base-devel package, a basic set of tools for further work with packages:
```
sudo pacman -Syu base-devel
```
Install git:
```
pacman -S git
```
Navigate to the directory for temporary file storage:
```
cd /tmp
```
Clone the repository to install the package:
```
git clone https://aur.archlinux.org/arcconf.git/
```
Here https://aur.archlinux.org/arcconf.git/ is the repository to clone. You can see it on the package page under Git Clone URL.
Navigate to the arcconf directory:
```
cd arcconf
```
Switch to the branch with the last commit.
```
git checkout 98153da254e10bb2655ad1c7e0e118b2dd7fd18c
```
Here 98153da254e10bb2655ad1c7e0e118b2dd7fd18c is the commit identifier. It can be viewed on the package page: click View PKGBUILD, click the commit tab and see the value in the commit line.

Create a user user with permissions for the /tmp/arcconf directory:

useradd -m user
sudo chown -R user /tmp/arcconf
sudo chmod -R 755 /tmp/arcconf

Switch to user user:
```
su user
```
Run the makepkg tool, it will check dependencies and build the package in the current directory:
```
makepkg
```
Look at the contents of the catalog:
```
ls
```
A list of the package files will appear in the response. For example:
```
arcconf-4.17.00.26540-1-x86_64.pkg.tar.zst        arcconf_v3_07_23980.zip  src
arcconf_B26540.zip                                pkg
arcconf-debug-4.17.00.26540-1-x86_64.pkg.tar.zst  PKGBUILD
```
Here arcconf-4.17.00.26540-1-x86_64.pkg.tar.zst is the name of the file to install the tool.
Copy the file name of the file to be installed.
Finalize the user user:
```
exit
```
Install arcconf:
```
pacman -U <file_name>
```
Specify <file_name> is the file name you copied in step 13.