Default [guide/script] speedtest using terminal

Basically there are 2 ways that I know to test download speed.

1) with busybox wget: Download script below and put for example in /data/local/tmp and chmod to 755. the script will calculate the average download speed to download 100M file from london. Maybe I can add later US servers.

2) with GNU wget. Install it from here . Thanks to @alireza7991 for this. After that go to terminal and type:
for london:
wget -O /dev/null
for dallas (you can change the download file name to for 10M and for 500M):
wget -O /dev/null
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