tgt: 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/tgt - from package: tcm

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

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