viewvc-svndbadmin: 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/sbin/viewvc-svndbadmin - from package: viewvc-query

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

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