snmp-bridge-mib: 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/snmp-bridge-mib - from package: net-snmp-perl

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

On Debian possible default full paths are:

/usr/bin/snmp-bridge-mib - from package: snmp

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

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