pcl_generate: 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/pcl_generate - from package: pcl-tools

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

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