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How can I use “:” as an AWK field separator?
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If you want to do it programatically, you can use the FS variable:
echo "1: " | awk 'BEGIN { FS=":" } /1/ { print $1 }'
Note that if you change it in the main loop rather than the BEGIN loop, it takes affect for the next line read in, since the current l...
Does deleting a branch in git remove it from the history?
...as a complete source tree, it is a very different structure from svn where all branches and tags (by convention) live in separate 'folders' of the repository alongside the special 'trunk'.
If the branch was merged into another branch before it was deleted then all of the commits will still be reach...
Allow multi-line in EditText view in Android?
How to allow multi-line in Android's EditText view?
15 Answers
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How to test if parameters exist in rails
...re asking about existence. You might need to differentiate:
Not there at all.
There but nil.
There but false.
There but an empty string.
as well. Hard to say without more details of your precise situation.
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How to customize a requirements.txt for multiple environments?
...eploy to Heroku which expects each branch's dependencies in a single file called 'requirements.txt'.
3 Answers
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How and where are Annotations used in Java?
...methods. Asking an object for its meta-object (e.g. anObj.getClass() ) is called introspection. The introspection can go further and we can ask a meta-object what are its annotations (e.g. aClass.getAnnotations). Introspection and annotations belong to what is called reflection and meta-programming....
How does Windows 8 Runtime (WinRT / Windows Store apps / Windows 10 Universal App) compare to Silver
...lso has parametrized ("generic") interfaces.
One other big change is that all WinRT components have metadata available for them, just like .NET assemblies. In COM you kinda sorta had that with typelibs, but not every COM component had them. For WinRT, the metadata is contained in .winmd files - loo...
error: 'Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)' — Miss
...rted off with me not being able to log in as root any more on my mysql install. I was attempting to run mysql without passwords turned on... but whenever I ran the command
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What's the difference between NOT EXISTS vs. NOT IN vs. LEFT JOIN WHERE IS NULL?
... NULL is less efficient
In PostgreSQL, NOT IN is less efficient
In Oracle, all three methods are the same.
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How can you do anything useful without mutable state?
...me, there are
tons of state variables, beginning
with the positions of all the
characters, who tend to move around
constantly. How can you possibly do
anything useful without keeping track
of changing values?
If you're interested, here's a series of articles which describe game program...