pcl_feature_matching: 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_feature_matching - from package: pcl-tools

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

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