snmpsim-mib2dev: 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/snmpsim-mib2dev - from package: snmpsim

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

Error in other languages:
snmpsim-mib2dev: bevel nie gevind nie
snmpsim-mib2dev: comandă negăsită
snmpsim-mib2dev: comando não encontrado
snmpsim-mib2dev: commande introuvable
snmpsim-mib2dev: command not found
snmpsim-mib2dev: käsku ei ole
snmpsim-mib2dev: không tìm thấy lệnh
snmpsim-mib2dev: komanda nerasta
snmpsim-mib2dev: Kommando nicht gefunden.
snmpsim-mib2dev: kommandot finns inte
snmpsim-mib2dev: komut yok
snmpsim-mib2dev: nie znaleziono polecenia
snmpsim-mib2dev: níor aimsíodh an t-ordú
snmpsim-mib2dev: no se encontró la orden
snmpsim-mib2dev: no s'ha trobat l'ordre
snmpsim-mib2dev: opdracht niet gevonden
snmpsim-mib2dev: parancs nem található
snmpsim-mib2dev: perintah tidak ditemukan
snmpsim-mib2dev: príkaz nenájdený
snmpsim-mib2dev: příkaz nenalezen
snmpsim-mib2dev: команда не найдена
snmpsim-mib2dev: командата не е открита
snmpsim-mib2dev: 命令找不到
snmpsim-mib2dev: コマンドが見つかりません