tkgate: 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 CentOS possible default full paths are:

/usr/bin/tkgate - from package: tkgate

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/tkgate - from package: tkgate

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

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