hgpushsvn: 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/hgpushsvn - from package: hgsvn

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

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