ao-test-baro: 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/ao-test-baro - from package: altos

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

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