pcl_extract_feature: 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 CentOS possible default full paths are:

/usr/bin/pcl_extract_feature - from package: pcl-tools

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/pcl_extract_feature - from package: pcl-tools

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

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