pcl_organized_segmentation_demo: 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_organized_segmentation_demo - from package: pcl-tools

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

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