apertium-unformat: 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/apertium-unformat - from package: apertium

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

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