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What does @@variable mean in Ruby?
What are Ruby variables preceded with double at signs ( @@ )? My understanding of a variable preceded with an at sign is that it is an instance variable, like this in PHP:
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How to gzip all files in all sub-directories into one compressed file in bash
This post describes how to gzip each file individually within a directory structure. However, I need to do something slightly different. I need to produce one big gzip file for all files under a certain directory. I also need to be able to specify the output filename for the compressed file (e.g., ...
How can I select random files from a directory in bash?
... about 2000 files. How can I select a random sample of N files through using either a bash script or a list of piped commands?
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How to convert an array of strings to an array of floats in numpy?
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Well, if you're reading the data in as a list, just do np.array(map(float, list_of_strings)) (or equivalently, use a list comprehension). (In Python 3, you'll need to call list on the map return value if you use map, since map returns an iterato...
Finding the author of a line of code in Mercurial
How do I find out who is responsible for a specific line of code? I know the linenumber and the filename but I would like Mercurial to tell me the author(s) of that specific line of code. Is there a command for that?
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How to handle Handler messages when activity/fragment is paused
Slight variation on my other posting
4 Answers
4
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Make a Bash alias that takes a parameter?
...hich lets you make an alias that takes a parameter. The notation was something like
20 Answers
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Is there a Pattern Matching Utility like GREP in Windows?
Is there a similar utility to grep available from the Windows Command Prompt, or is there a third party tool for it?
32 A...
When to use MyISAM and InnoDB? [duplicate]
...d as a result it performs very fast read operations. If your read to write(insert|update) ratio is less than 15% its better to use MyISAM.
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Build tree array from flat array in javascript
...x json file that I have to handle with javascript to make it hierarchical, in order to later build a tree.
Every entry of the json has :
id : a unique id,
parentId : the id of the parent node (which is 0 if the node is a root of the tree)
level : the level of depth in the tree
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