dms_dropdb: 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/sbin/dms_dropdb - from package: dms-core

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

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