gtst-long: 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/gtst-long - from package: scotch

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

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