uudecode: 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/uudecode - from package: sharutils

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

On Debian possible default full paths are:

/usr/bin/uudecode - from package: sharutils

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

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