getop: 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/lib64/erlang/lib/observer-0.9.10/priv/bin/getop - from package: erlang-observer

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