octave: 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 CentOS possible default full paths are:

/usr/bin/octave - from package: octave

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/octave - from package: octave
/var/lib/wims/public_html/bin/octave - from package: wims

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

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