pcl_ni_trajkovic: 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_ni_trajkovic - from package: pcl-tools

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

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