ftpshut: 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/ftpshut - from package: proftpd

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

On Debian possible default full paths are:

/usr/sbin/ftpshut - from package: proftpd-basic

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

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