dlm_tool: 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/sbin/dlm_tool - from package: cman

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

On Debian possible default full paths are:

/usr/sbin/dlm_tool - from package: cman

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

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