mha-decode: 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 CentOS possible default full paths are:

/usr/bin/mha-decode - from package: mhonarc

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/mha-decode - from package: mhonarc

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

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