svn: 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/svn - from package: subversion

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

On Debian possible default full paths are:

/usr/bin/svn - from package: subversion

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

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