reducecap: 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/reducecap - from package: util-vserver

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

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