dcm_rm_group: 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 Debian possible default full paths are:

/usr/bin/dcm_rm_group - from package: ctn

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

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