seeker: 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/sbin/seeker - from package: seeker

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

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