perlanet: command not found

Have You tried accessing the binary with the full path?

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/perlanet - from package: libperlanet-perl

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