open-axiom: 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/open-axiom - from package: open-axiom

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

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