oldfind: 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/bin/oldfind - from package: findutils

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

On Debian possible default full paths are:

/usr/bin/oldfind - from package: findutils

You may install the required package with command apt-get install {package}

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