perl5.20.2: 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/perl5.20.2 - from package: perl-base

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

Error in other languages:
perl5.20.2: bevel nie gevind nie
perl5.20.2: comandă negăsită
perl5.20.2: comando não encontrado
perl5.20.2: commande introuvable
perl5.20.2: command not found
perl5.20.2: käsku ei ole
perl5.20.2: không tìm thấy lệnh
perl5.20.2: komanda nerasta
perl5.20.2: Kommando nicht gefunden.
perl5.20.2: kommandot finns inte
perl5.20.2: komut yok
perl5.20.2: nie znaleziono polecenia
perl5.20.2: níor aimsíodh an t-ordú
perl5.20.2: no se encontró la orden
perl5.20.2: no s'ha trobat l'ordre
perl5.20.2: opdracht niet gevonden
perl5.20.2: parancs nem található
perl5.20.2: perintah tidak ditemukan
perl5.20.2: príkaz nenájdený
perl5.20.2: příkaz nenalezen
perl5.20.2: команда не найдена
perl5.20.2: командата не е открита
perl5.20.2: 命令找不到
perl5.20.2: コマンドが見つかりません