gamt: 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/gamt - from package: amtterm

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

On Debian possible default full paths are:

/usr/bin/gamt - from package: gamt

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

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