clipjoin: 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/clipjoin - from package: perl-Clipboard

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

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