perl6: 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/perl6 - from package: rakudo-star

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

On Debian possible default full paths are:

/usr/bin/perl6 - from package: rakudo

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

Error in other languages:
perl6: bevel nie gevind nie
perl6: comandă negăsită
perl6: comando não encontrado
perl6: commande introuvable
perl6: command not found
perl6: käsku ei ole
perl6: không tìm thấy lệnh
perl6: komanda nerasta
perl6: Kommando nicht gefunden.
perl6: kommandot finns inte
perl6: komut yok
perl6: nie znaleziono polecenia
perl6: níor aimsíodh an t-ordú
perl6: no se encontró la orden
perl6: no s'ha trobat l'ordre
perl6: opdracht niet gevonden
perl6: parancs nem található
perl6: perintah tidak ditemukan
perl6: príkaz nenájdený
perl6: příkaz nenalezen
perl6: команда не найдена
perl6: командата не е открита
perl6: 命令找不到
perl6: コマンドが見つかりません