gmk_hy: 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/gmk_hy - from package: scotch

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

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