perl5.10.1: 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 CentOS possible default full paths are:

/usr/bin/perl5.10.1 - from package: perl

You may install the required package with command yum install {package}
Error in other languages:
perl5.10.1: bevel nie gevind nie
perl5.10.1: comandă negăsită
perl5.10.1: comando não encontrado
perl5.10.1: commande introuvable
perl5.10.1: command not found
perl5.10.1: käsku ei ole
perl5.10.1: không tìm thấy lệnh
perl5.10.1: komanda nerasta
perl5.10.1: Kommando nicht gefunden.
perl5.10.1: kommandot finns inte
perl5.10.1: komut yok
perl5.10.1: nie znaleziono polecenia
perl5.10.1: níor aimsíodh an t-ordú
perl5.10.1: no se encontró la orden
perl5.10.1: no s'ha trobat l'ordre
perl5.10.1: opdracht niet gevonden
perl5.10.1: parancs nem található
perl5.10.1: perintah tidak ditemukan
perl5.10.1: príkaz nenájdený
perl5.10.1: příkaz nenalezen
perl5.10.1: команда не найдена
perl5.10.1: командата не е открита
perl5.10.1: 命令找不到
perl5.10.1: コマンドが見つかりません