remove-ds-admin: 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 Debian possible default full paths are:

/usr/sbin/remove-ds-admin - from package: 389-admin

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

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