dtagnames: 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/dtagnames - from package: dwarves

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

On Debian possible default full paths are:

/usr/bin/dtagnames - from package: dwarves

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

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