rasmol-classic: 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/rasmol-classic - from package: rasmol

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

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