sensors-detect: 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 CentOS possible default full paths are:

/usr/sbin/sensors-detect - from package: lm_sensors

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/sbin/sensors-detect - from package: lm-sensors

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

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