ddms: command not found

Have You tried accessing the binary with the full path?

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/ddms - from package: androidsdk-ddms

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