jmol: 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/jmol - from package: jmol

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

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