optic: 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/optic - from package: abinit

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

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