clipfilter: 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/clipfilter - from package: perl-Clipboard

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

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