nxrancid: 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/nxrancid - from package: rancid

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

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