avs2ps: 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/avs2ps - from package: raster3d

You may install the required package with command apt-get install {package}
Error in other languages:
avs2ps: bevel nie gevind nie
avs2ps: comandă negăsită
avs2ps: comando não encontrado
avs2ps: commande introuvable
avs2ps: command not found
avs2ps: käsku ei ole
avs2ps: không tìm thấy lệnh
avs2ps: komanda nerasta
avs2ps: Kommando nicht gefunden.
avs2ps: kommandot finns inte
avs2ps: komut yok
avs2ps: nie znaleziono polecenia
avs2ps: níor aimsíodh an t-ordú
avs2ps: no se encontró la orden
avs2ps: no s'ha trobat l'ordre
avs2ps: opdracht niet gevonden
avs2ps: parancs nem található
avs2ps: perintah tidak ditemukan
avs2ps: príkaz nenájdený
avs2ps: příkaz nenalezen
avs2ps: команда не найдена
avs2ps: командата не е открита
avs2ps: 命令找不到
avs2ps: コマンドが見つかりません