oidentd: 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/oidentd - from package: oidentd

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

On Debian possible default full paths are:

/usr/sbin/oidentd - from package: oidentd

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

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