xform2itk: 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/lib/cmtk/bin/xform2itk - from package: cmtk

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

Error in other languages:
xform2itk: bevel nie gevind nie
xform2itk: comandă negăsită
xform2itk: comando não encontrado
xform2itk: commande introuvable
xform2itk: command not found
xform2itk: käsku ei ole
xform2itk: không tìm thấy lệnh
xform2itk: komanda nerasta
xform2itk: Kommando nicht gefunden.
xform2itk: kommandot finns inte
xform2itk: komut yok
xform2itk: nie znaleziono polecenia
xform2itk: níor aimsíodh an t-ordú
xform2itk: no se encontró la orden
xform2itk: no s'ha trobat l'ordre
xform2itk: opdracht niet gevonden
xform2itk: parancs nem található
xform2itk: perintah tidak ditemukan
xform2itk: príkaz nenájdený
xform2itk: příkaz nenalezen
xform2itk: команда не найдена
xform2itk: командата не е открита
xform2itk: 命令找不到
xform2itk: コマンドが見つかりません