isadump: 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/isadump - from package: lm_sensors

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

On Debian possible default full paths are:

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

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

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