mrvrancid: 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/lib/rancid/bin/mrvrancid - from package: rancid

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

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