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Check if database exists in PostgreSQL using shell
...rows" will succeed. So we pipe this output through a bunch of built-in command line tools to only search in the first column.
The -t flag removes headers and footers:
my_db | my_user | UTF8 | en_US.UTF8 | en_US.UTF8 |
postgres | postgres | LATIN1 | en_US | en_US |
te...
How do you scroll up/down on the Linux console?
I recognize that Up / Down will give you the command history. But, how do you look at past output by scrolling up and down?
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TFS checkin error - could not find file
...ce Control Explorer (View > Other Windows > Source Control Explorer) and either Delete the nonexistent files or right-click on the offending files and Undo Pending Changes.
You can also undo these specific changes from the Pending Changes panel in Team Explorer.
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How can I convert spaces to tabs in Vim or Linux?
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Using Vim to expand all leading spaces (wider than 'tabstop'), you were right to use retab but first ensure 'expandtab' is reset (:verbose set ts? et? is your friend). retab takes a range, so I usually specify % to mean "the whole file".
:s...
What is the closest thing Windows has to fork()?
...ss call. Next, the parent
process calls setjmp to save its own
context and sets a pointer to this in
a Cygwin shared memory area (shared
among all Cygwin tasks). It then fills
in the child's .data and .bss sections
by copying from its own address space
into the suspended child's addres...
Count rows with not empty value
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I just used =COUNTIF(Range, "<>") and it counted non-empty cells for me.
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Changing names of parameterized tests
...r value from this invocation of the test.
{1} - the second parameter value
and so on
The final name of the test will be the name of the test method, followed by the namestring in brackets, as shown below.
For example (adapted from the unit test for the Parameterized annotation):
@RunWith(Paramet...
Auto-center map with multiple markers in Google Maps API v3
...ener(listener);
});
This way, you can use an arbitrary number of points, and don't need to know the order beforehand.
Demo jsFiddle here: http://jsfiddle.net/x5R63/
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Is it possible to target older iOS versions when using Xcode 4.2 and iOS 5 SDK?
I just recently downloaded the Xcode 4.2 with iOS 5 SDK package and I immediately noticed that I am unable to use my iPhone 3Gs with iOS 4.2.1 for debugging. I am only able to debug and test on my iphone 4 with iOS 5 installed.
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lenses, fclabels, data-accessor - which library for structure access and mutation is better
There are at least three popular libraries for accessing and manipulating fields of records. The ones I know of are: data-accessor, fclabels and lenses.
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