dwpage.php: 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/share/dokuwiki/bin/dwpage.php - from package: dokuwiki

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

On Debian possible default full paths are:

/usr/share/dokuwiki/bin/dwpage.php - from package: dokuwiki

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

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