elfinfo: 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/elfinfo - from package: elfinfo

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