pcl_ppf_object_recognition: 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_ppf_object_recognition - from package: pcl-tools

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

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