cmd_read: 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/cmd_read - from package: xenomai-runtime

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

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