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How do I syntax check a Bash script without running it?
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386
bash -n scriptname
Perhaps an obvious caveat: this validates syntax but won't check if your ...
Modulo operation with negative numbers
... sense, logically. Right?
Let's see what this leads to:
Example A. 5/(-3) is -1
=> (-1) * (-3) + 5%(-3) = 5
This can only happen if 5%(-3) is 2.
Example B. (-5)/3 is -1
=> (-1) * 3 + (-5)%3 = -5
This can only happen if (-5)%3 is -2
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Copying files from host to Docker container
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basickarl
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answered Aug 12 '15 at 17:25
0x7d7b0x7d7b
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string c_str() vs. data()
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edited Oct 29 '13 at 11:10
Aaron McDaid
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Differences between fork and exec
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374
The use of fork and exec exemplifies the spirit of UNIX in that it provides a very simple way ...
How to create has_and_belongs_to_many associations in Factory girl
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133
Here is the solution that works for me.
FactoryGirl.define do
factory :company do
#comp...
What is the difference between FragmentPagerAdapter and FragmentStatePagerAdapter?
...is case you will use FragmentStatePagerAdapter. If you are just displaying 3 "tabs" that do not contain a lot of heavy data (like Bitmaps), then FragmentPagerAdapter might suit you well. Also, keep in mind that ViewPager by default will load 3 fragments into memory. The first Adapter you mention mig...
Rerender view on browser resize with React
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Matt Fletcher
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answered Sep 25 '13 at 20:21
Sophie AlpertSophie Alpert
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ROW_NUMBER() in MySQL
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I want the row with the single highest col3 for each (col1, col2) pair.
That's a groupwise maximum, one of the most commonly-asked SQL questions (since it seems like it should be easy, but actually it kind of isn't).
I often plump for a null-self-join:
SELECT t0....