snmptt: command not found

Have You tried accessing the binary with the full path?

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/sbin/snmptt - from package: snmptt

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

On Debian possible default full paths are:

/usr/sbin/snmptt - from package: snmptt

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