cvspurge: 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/bin/cvspurge - from package: cvsutils

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

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