dpm-modifyfs: 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/dpm-modifyfs - from package: dpm

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

On Debian possible default full paths are:

/usr/bin/dpm-modifyfs - from package: dpm

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

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