xrancid: command not found

Have You tried accessing the binary with the full path?

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/xrancid - from package: rancid

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