hxunpipe: 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/hxunpipe - from package: html-xml-utils

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