nsdb-simple-nce: 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/sbin/nsdb-simple-nce - from package: fedfs-utils-admin

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

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