decode-dimms: 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/decode-dimms - from package: i2c-tools

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

On Debian possible default full paths are:

/usr/bin/decode-dimms - from package: i2c-tools

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

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