svnversion: 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/svnversion - from package: subversion

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

On Debian possible default full paths are:

/usr/bin/svnversion - from package: subversion

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

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