cvsservice: 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 CentOS possible default full paths are:

/usr/bin/cvsservice - from package: kdesdk

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/cvsservice - from package: cvsservice

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

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