cert2ldap: 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/cert2ldap - from package: mod_authz_ldap

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

Error in other languages:
cert2ldap: bevel nie gevind nie
cert2ldap: comandă negăsită
cert2ldap: comando não encontrado
cert2ldap: commande introuvable
cert2ldap: command not found
cert2ldap: käsku ei ole
cert2ldap: không tìm thấy lệnh
cert2ldap: komanda nerasta
cert2ldap: Kommando nicht gefunden.
cert2ldap: kommandot finns inte
cert2ldap: komut yok
cert2ldap: nie znaleziono polecenia
cert2ldap: níor aimsíodh an t-ordú
cert2ldap: no se encontró la orden
cert2ldap: no s'ha trobat l'ordre
cert2ldap: opdracht niet gevonden
cert2ldap: parancs nem található
cert2ldap: perintah tidak ditemukan
cert2ldap: príkaz nenájdený
cert2ldap: příkaz nenalezen
cert2ldap: команда не найдена
cert2ldap: командата не е открита
cert2ldap: 命令找不到
cert2ldap: コマンドが見つかりません