myson-diag: 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
/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/sbin/myson-diag - from package: nictools-pci

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