hackrf_cpldjtag: 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/hackrf_cpldjtag - from package: hackrf

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