clufter: command not found

Have You tried accessing the binary with the full path?

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/clufter - from package: clufter-cli

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