istgtcontrol: 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/sbin/istgtcontrol - from package: istgt

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

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