cvsdbadmin: 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/lib/python2.6/site-packages/viewvc/bin/cvsdbadmin - from package: viewvc

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

On Debian possible default full paths are:

/usr/share/gforge/www/scm/viewvc/bin/cvsdbadmin - from package: gforge-web-apache2
/usr/lib/viewvc/bin/cvsdbadmin - from package: viewvc-query

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

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