clipper_test: 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/clipper_test - from package: clipper-devel

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

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