ds_removal: 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/ds_removal - from package: 389-admin

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

On Debian possible default full paths are:

/usr/sbin/ds_removal - from package: 389-admin

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

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