Add sleep as an example of the Unix philosophy and use it to introduce CRTL+C

[swcarpentry]

Add sleep as an example of the Unix philosophy and use it to introduce CRTL+C

[gvwilson]

• +1 to having a newcomer do it.
• -1 to including this in the novice lesson -- it's not useful to
  scientists right away.
• +1 to including it in shell-extras along with job control or cron.

Thanks,
Greg

[rgaiacs]

@iglpdc My suggestion is change a little our starting point to something like

Nelle Nemo, a marine biologist, has just returned from a six-month survey of the North Pacific Gyre, where she has been sampling gelatinous marine life in the Great Pacific Garbage Patch. She has 300 samples that still in Great Pacific Garbage Patch's server since her laptop broken during the return. One college from Nelle's lab helps getting all the 300 samples with

for i in $(seq 1 300)
do
wget http://someaddress.com/${i}
sleep 10
done

that only takes a few minutes instead of hours if Nelle goes clicking one by one with the mouse.

The `sleep` command was needed because the server only accept a few request per minute.

Now, Nelle has to analyses her data using some programs. Based on the experience of downloading her data she decided to learn a little about the Unix shell to save a lot of time since ... 

And add a note at instructors note that they should mention CTRL+C when running this example.

[gvwilson]

In shell-extras, +1, but definitely not in shell-novice: we're not going
to try go introduce seq, wget, and ${i}.

On 2015-03-19 3:30 PM, Raniere Silva wrote:

@iglpdc https://github.com/iglpdc My suggestion is change a little
our starting point to something like

Nelle Nemo, a marine biologist, has just returned from a six-month
survey of the North Pacific Gyre, where she has been sampling
gelatinous marine life in the Great Pacific Garbage Patch. She has
300 samples that still in Great Pacific Garbage Patch's server
since her laptop broken during the return. One college from
Nelle's lab helps getting all the 300 samples with

|for i in $(seq 1 300)
do
wget http://someaddress.com/${i}
sleep 10
done

that only takes a few minutes instead of hours if Nelle goes clicking one by one with the mouse.

The `sleep` command was needed because the server only accept a few request per minute.

Now, Nelle has to analyses her data using some programs. Based on the experience of downloading her data she decided to learn a little about the Unix shell to save a lot of time since ...
|

And add a note at instructors note that they should mention |CTRL+C|
when running this example.

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Dr. Greg Wilson | [email protected]
Software Carpentry | http://software-carpentry.org