snmpdf: 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/snmpdf - from package: net-snmp-utils

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

On Debian possible default full paths are:

/usr/bin/snmpdf - from package: snmp

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

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