lookat: 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/lookat - from package: openvrml-lookat

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

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