plowup: 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/plowup - from package: plowshare

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

On Debian possible default full paths are:

/usr/bin/plowup - from package: plowshare4

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

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