hgpullsvn: 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/hgpullsvn - from package: hgsvn

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

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