fedfind: 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/fedfind - from package: fedfind

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