spew: 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/spew - from package: spew

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

On Debian possible default full paths are:

/usr/bin/spew - from package: spew

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

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