pyew: 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/bin/pyew - from package: pyew

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

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