viewalone: command not found

Have You tried accessing the binary with the full path?

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/lib/axiom-20140801/bin/viewalone - from package: axiom-graphics
/usr/lib/open-axiom/bin/viewAlone - from package: open-axiom-graphics

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