Source: How to Make a Captive Portal of Death – InfoSec Write-ups – Medium
Category: English
Variables · Functions · Interpolation · Brace expansions · Loops · Conditional execution · Command substitution · One-page guide to Bash scripting
Source: Bash scripting cheatsheet
On human feedback loops: https://t.co/KBNRCQeoGU
— Daniel Gross 💡 (@danielgross) March 9, 2018
Ever considered buying some second hand camera lens? twiching.com has written a post for the non expert.
Know what you’re after. Do a bit of research on the lens you want. Classifieds, eBay, etc will give you an idea of the price, and camera forums will give you an idea of common problems to check for with specific models. Both of those are probably more useful than most of the stuff below.
With that in mind, here’s some general steps for checking out a lens…
Want to Teach Kids to Code? Send ‘Em to a ‘Hack Jam’
100 Kids and their adults gathered last weekend in Los Angeles to learn how to program, how to think, and how to start making things. This is what happened and why.
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Second Reality
Almost 19 years ago was released Second Reality, a demo made by Future Crew. At this time, the 486DX2 was the best processor – the 60 MHz Pentium was available but unaffordable.
The other day I had enough calculating the time so I just wrote this script:
cat > ~/bin/timediff
#!/bin/sh
if [ -z $2 ]; then
echo "usage: $0
echo
echo "ex. $0 11:49 12:51"
exit 1
fi
end=`date +%s -d"$2"`
start=`date +%s -d"$1"`
diff=$(($end-$start))
diff=$(($diff/60))
hours=$(($diff/60))
min=$(($diff%60))
# Prepend a 0 if minute <10
if [ ${#min} -eq 1 ]; then
min=0$min
fi
echo "$hours:$min"
Of course, it works in some cases only. This one is fine:
$ sh ~/bin/timediff 11:49 12:51
1:02
Whereas this one will not work:
$ sh ~/bin/timediff 11:49 1:51
-9:-58
But the output is quite obvious.