snmpvacm: 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/snmpvacm - 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/snmpvacm - from package: snmp

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

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