perl: 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/perl - from package: perl

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

On Debian possible default full paths are:

/usr/bin/perl - from package: perl-base

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

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