ivinfo: 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/ivinfo - from package: inventor-clients

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

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