cvsu: 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/cvsu - from package: cvsutils

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

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