sensors: 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/bin/sensors - from package: lm_sensors

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

On Debian possible default full paths are:

/usr/bin/sensors - from package: lm-sensors

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

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