pdwtags: 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/pdwtags - from package: dwarves

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

On Debian possible default full paths are:

/usr/bin/pdwtags - from package: dwarves

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

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