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grex

grex is a command-line tool and library for generating regular expressions from user-provided test cases: https://github.com/pemistahl/grex

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Bash scripting cheatsheet

Variables · Functions · Interpolation · Brace expansions · Loops · Conditional execution · Command substitution · One-page guide to Bash scripting

Source: Bash scripting cheatsheet

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an amazing directory: /proc

an amazing directory: /proc
an amazing directory: /proc
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Human Artificial Intelligence

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LA Youth Hack Jam

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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Elapsed time in UNIX shell

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.

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Nice OpenSSL usage tips and examples page

http://conshell.net/wiki/index.php/OpenSSL_usage_tips_and_examples

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ACPI quoi c’eeeeeeeeeestt

I hear it all the time, I have issue with it, so this time i know how it does work a bit more.
thanks to the following : ACPI explained