ldbmodify: 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/ldbmodify - from package: ldb-tools

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

On Debian possible default full paths are:

/usr/bin/ldbmodify - from package: ldb-tools

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

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