comedi_board_info: 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 Debian possible default full paths are:

/usr/bin/comedi_board_info - from package: libcomedi0

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