test-amdtp: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/test-amdtp - from package: libiec61883-utils

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