svngettags: 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/svngettags - from package: kdesdk

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

On Debian possible default full paths are:

/usr/bin/svngettags - from package: kdesdk-scripts

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

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