pcl_point_cloud_editor: 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_point_cloud_editor - from package: pcl-tools

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

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