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Remove blank lines with grep
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Try the following:
grep -v -e '^$' foo.txt
The -e option allows regex patterns for matching.
The single quotes around ^$ makes it work for Cshell. Other shells will be happy with either single or double quotes.
UPDATE: This works for me for a file with blank lines or "all white ...
Python - Create list with numbers between 2 values?
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Use range. In Python 2.x it returns a list so all you need is:
>>> range(11, 17)
[11, 12, 13, 14, 15, 16]
In Python 3.x range is a iterator. So, you need to convert it to a list:
>>> list(range(11, 17))
[11, 12, 13, 14, 15, 16]
Note: The second nu...
Bootstrap 3 Glyphicons are not working
...ome kind of "E003" error. Any ideas why this is happening? I tried both locally and online and I still get the same problem.
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Understanding keystore, certificates and alias
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The dev site suggests using the same certificate for all your apps. So does this mean, as long as I'm using the same keystore, I can use any alias with any password and it won't mess up updates, as it's just a reference? The actual keystore is the important part?
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std::vector versus std::array in C++
... should one be preferred over another? What are the pros and cons of each? All my textbook does is list how they are the same.
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Set up git to pull and push all branches
I'd like to push and pull all the branches by default, including the newly created ones.
8 Answers
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How do I search within an array of hashes by hash values in ruby?
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You're looking for Enumerable#select (also called find_all):
@fathers.select {|father| father["age"] > 35 }
# => [ { "age" => 40, "father" => "Bob" },
# { "age" => 50, "father" => "Batman" } ]
Per the documentation, it "returns an array contai...
Maven and adding JARs to system scope
...ption) specify the proper repository (if one exists) so it can be automatically downloaded by maven
In either case, remove the <systemPath> tag from the dependency
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Why is #!/usr/bin/env bash superior to #!/bin/bash?
...or example, on my OpenBSD system, it's in /usr/local/bin, since it was installed as an optional package.
If you are absolutely sure bash is in /bin and will always be, there's no harm in putting it directly in your shebang—but I'd recommend against it because scripts and programs all have lives b...
What is git actually doing when it says it is “resolving deltas”?
... then spends about the same amount of time "resolving deltas". What's actually happening during this phase of the clone?
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