svnauthz: 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/svnauthz - from package: subversion

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

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