gmtst: 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/gmtst - from package: scotch

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

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