scrapy-ws: 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/scrapy-ws - from package: python-scrapy

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

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