jsvnsync: command not found

Have You tried accessing the binary with the full path?

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/jsvnsync - from package: svnkit

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