chown: 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:

/bin/chown - from package: coreutils

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

On Debian possible default full paths are:

/bin/chown - from package: coreutils

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

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