Command 'unrar' not found

[Eva-xx]

Hello! I am a beginner. I tried to install Unrar following your method and I have successfully installed it.

'unrar' -> '/home/jinxx/app/bin'
unrar installed on /home/jinxx/app

However, the following error occurred when I used the unrar command：

Command 'unrar' not found, but can be installed with:

apt install unrar-free  # version 1:0.0.1+cvs20140707-4, or
apt install unrar       # version 1:5.6.6-2build1

I have changed the environment variables, but I have a question, I don't see the app/lib and app/lib64 folders, why do I need to add them to the environment variables?

export ZZROOT=$HOME/app
export PATH=$ZZROOT/bin:$PATH
export LD_LIBRARY_PATH=$ZZROOT/lib:$ZZROOT/lib64:$LD_LIBRARY_PATH