dvtm: 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/dvtm - from package: dvtm

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

On Debian possible default full paths are:

/usr/bin/dvtm - from package: dvtm

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

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