free42dec: 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/free42dec - from package: free42

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

Error in other languages:
free42dec: bevel nie gevind nie
free42dec: comandă negăsită
free42dec: comando não encontrado
free42dec: commande introuvable
free42dec: command not found
free42dec: käsku ei ole
free42dec: không tìm thấy lệnh
free42dec: komanda nerasta
free42dec: Kommando nicht gefunden.
free42dec: kommandot finns inte
free42dec: komut yok
free42dec: nie znaleziono polecenia
free42dec: níor aimsíodh an t-ordú
free42dec: no se encontró la orden
free42dec: no s'ha trobat l'ordre
free42dec: opdracht niet gevonden
free42dec: parancs nem található
free42dec: perintah tidak ditemukan
free42dec: príkaz nenájdený
free42dec: příkaz nenalezen
free42dec: команда не найдена
free42dec: командата не е открита
free42dec: 命令找不到
free42dec: コマンドが見つかりません