snmpsimd: 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/snmpsimd - from package: snmpsim

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

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