genion: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/genion - from package: gromacs

You may install the required package with command apt-get install {package}

Error in other languages:
genion: bevel nie gevind nie
genion: comandă negăsită
genion: comando não encontrado
genion: commande introuvable
genion: command not found
genion: käsku ei ole
genion: không tìm thấy lệnh
genion: komanda nerasta
genion: Kommando nicht gefunden.
genion: kommandot finns inte
genion: komut yok
genion: nie znaleziono polecenia
genion: níor aimsíodh an t-ordú
genion: no se encontró la orden
genion: no s'ha trobat l'ordre
genion: opdracht niet gevonden
genion: parancs nem található
genion: perintah tidak ditemukan
genion: príkaz nenájdený
genion: příkaz nenalezen
genion: команда не найдена
genion: командата не е открита
genion: 命令找不到
genion: コマンドが見つかりません