ionscript: 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/bin/ionscript - from package: ion

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