gltpd: 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/gltpd - from package: ogdi

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

On Debian possible default full paths are:

/usr/bin/gltpd - from package: ogdi-bin

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

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