pysnmpbulkwalk: 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/pysnmpbulkwalk - from package: python-pysnmp4-apps

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

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