dds2tar: 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/dds2tar - from package: dds2tar

You may install the required package with command apt-get install {package}
Error in other languages:
dds2tar: bevel nie gevind nie
dds2tar: comandă negăsită
dds2tar: comando não encontrado
dds2tar: commande introuvable
dds2tar: command not found
dds2tar: käsku ei ole
dds2tar: không tìm thấy lệnh
dds2tar: komanda nerasta
dds2tar: Kommando nicht gefunden.
dds2tar: kommandot finns inte
dds2tar: komut yok
dds2tar: nie znaleziono polecenia
dds2tar: níor aimsíodh an t-ordú
dds2tar: no se encontró la orden
dds2tar: no s'ha trobat l'ordre
dds2tar: opdracht niet gevonden
dds2tar: parancs nem található
dds2tar: perintah tidak ditemukan
dds2tar: príkaz nenájdený
dds2tar: příkaz nenalezen
dds2tar: команда не найдена
dds2tar: командата не е открита
dds2tar: 命令找不到
dds2tar: コマンドが見つかりません