aptitude:tldr:213ee

This command installs a specific package specified by the name stored in the ${package} variable using the aptitude package manager on a Debian-based operating system.

The aptitude command is a powerful package management tool that allows users to search, install, upgrade, and remove packages on their system.

In this case, the command uses the "install" subcommand to download and install the package specified by the variable ${package}. The ${package} variable is likely defined elsewhere in the code or script.

For example, if the value of ${package} is "nginx", the command would be interpreted as "aptitude install nginx" and would attempt to download and install the Nginx web server package.

Note that prior to running this command, it is recommended to update the package lists by running "aptitude update". Additionally, administrative privileges may be required to install packages using aptitude, so the command may need to be executed with sudo or as the root user.