uhd_cal_tx_dc_offset: 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/uhd_cal_tx_dc_offset - from package: uhd-host

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

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