sweeper: 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/sweeper - from package: kdeutils

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

On Debian possible default full paths are:

/usr/bin/sweeper - from package: sweeper

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

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