hachoir-subfile: 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/hachoir-subfile - from package: python-hachoir-subfile

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

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