ldapadd: 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/ldapadd - from package: openldap-clients

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

On Debian possible default full paths are:

/usr/bin/ldapadd - from package: ldap-utils

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