utf7decode: 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 Debian possible default full paths are:

/usr/bin/utf7decode - from package: sendfile

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

Error in other languages:
utf7decode: bevel nie gevind nie
utf7decode: comandă negăsită
utf7decode: comando não encontrado
utf7decode: commande introuvable
utf7decode: command not found
utf7decode: käsku ei ole
utf7decode: không tìm thấy lệnh
utf7decode: komanda nerasta
utf7decode: Kommando nicht gefunden.
utf7decode: kommandot finns inte
utf7decode: komut yok
utf7decode: nie znaleziono polecenia
utf7decode: níor aimsíodh an t-ordú
utf7decode: no se encontró la orden
utf7decode: no s'ha trobat l'ordre
utf7decode: opdracht niet gevonden
utf7decode: parancs nem található
utf7decode: perintah tidak ditemukan
utf7decode: príkaz nenájdený
utf7decode: příkaz nenalezen
utf7decode: команда не найдена
utf7decode: командата не е открита
utf7decode: 命令找不到
utf7decode: コマンドが見つかりません