cvsco: 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/bin/cvsco - from package: cvsutils

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