mia-3dbrainextractT1: 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/mia-3dbrainextractT1 - from package: mia-tools

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

Error in other languages:
mia-3dbrainextractT1: bevel nie gevind nie
mia-3dbrainextractT1: comandă negăsită
mia-3dbrainextractT1: comando não encontrado
mia-3dbrainextractT1: commande introuvable
mia-3dbrainextractT1: command not found
mia-3dbrainextractT1: käsku ei ole
mia-3dbrainextractT1: không tìm thấy lệnh
mia-3dbrainextractT1: komanda nerasta
mia-3dbrainextractT1: Kommando nicht gefunden.
mia-3dbrainextractT1: kommandot finns inte
mia-3dbrainextractT1: komut yok
mia-3dbrainextractT1: nie znaleziono polecenia
mia-3dbrainextractT1: níor aimsíodh an t-ordú
mia-3dbrainextractT1: no se encontró la orden
mia-3dbrainextractT1: no s'ha trobat l'ordre
mia-3dbrainextractT1: opdracht niet gevonden
mia-3dbrainextractT1: parancs nem található
mia-3dbrainextractT1: perintah tidak ditemukan
mia-3dbrainextractT1: príkaz nenájdený
mia-3dbrainextractT1: příkaz nenalezen
mia-3dbrainextractT1: команда не найдена
mia-3dbrainextractT1: командата не е открита
mia-3dbrainextractT1: 命令找不到
mia-3dbrainextractT1: コマンドが見つかりません