gtscheck: 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/gtscheck - from package: libgts-bin

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

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