osmocom_spectrum_sense: 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/osmocom_spectrum_sense - from package: gr-osmosdr

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

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