octave-cli: 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/octave-cli - from package: octave

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

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