las2ogr: 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/las2ogr - from package: liblas-bin

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

Error in other languages:
las2ogr: bevel nie gevind nie
las2ogr: comandă negăsită
las2ogr: comando não encontrado
las2ogr: commande introuvable
las2ogr: command not found
las2ogr: käsku ei ole
las2ogr: không tìm thấy lệnh
las2ogr: komanda nerasta
las2ogr: Kommando nicht gefunden.
las2ogr: kommandot finns inte
las2ogr: komut yok
las2ogr: nie znaleziono polecenia
las2ogr: níor aimsíodh an t-ordú
las2ogr: no se encontró la orden
las2ogr: no s'ha trobat l'ordre
las2ogr: opdracht niet gevonden
las2ogr: parancs nem található
las2ogr: perintah tidak ditemukan
las2ogr: príkaz nenájdený
las2ogr: příkaz nenalezen
las2ogr: команда не найдена
las2ogr: командата не е открита
las2ogr: 命令找不到
las2ogr: コマンドが見つかりません