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How to insert a text at the beginning of a file?
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If the file is only one line, you can use:
sed 's/^/insert this /' oldfile > newfile
If it's more than one line. one of:
sed '1s/^/insert this /' oldfile > newfile
sed '1,1s/^/insert this /' oldfile > newfile
I've included the lat...
How to determine the encoding of text?
...ew bytes of the file. If an encoding is detected at this stage, it will be one of the UTF-* encodings, EBCDIC, or ASCII.
An encoding sniffed by the chardet library, if you have it installed.
UTF-8
Windows-1252
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How do I start PowerShell from Windows Explorer?
...ntrols the context menu of a different Windows Explorer object. The first one is the one you asked about:
HKCR\Directory\Background\shell - This is the context menu for the Explorer window itself (that is, the context menu that is displayed when no item is selected, such as when right-clicking in...
Light weight alternative to Hibernate? [closed]
...elationships. I also looked at a few ActiveRecord style ORM's for Java. None seemed mature or any easier than Hibernate. So, I'm going back to Hibernate.
– devdanke
Mar 16 '12 at 13:26
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How does Dijkstra's Algorithm and A-Star compare?
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Great answer for anyone that knows heuristics ;)
– lindhe
May 19 '15 at 8:44
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'Java' is not recognized as an internal or external command
...however, this makes a little more annoying when you need to have more than one java version on your machine (that way you only need to change JAVA_HOME and don't even bother with PATH)
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Are there any smart cases of runtime code modification?
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This has been done in computer graphics, specifically software renderers for optimization purposes. At runtime the state of many parameters is examined and an optimized version of the rasterizer code is generated (potentially eliminating a ...
Add file extension to files with bash
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for f in *.jpg; do mv "$f" "${f%.jpg}"; done
for f in *; do mv "$f" "$f.jpg"; done
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“Unknown provider: aProvider
...site in Chrome, with the DevTools open. Which results in an error like the one below being logged:
The method in the call trace we're interested in, is the one I marked with an arrow. This is providerInjector in injector.js. You're going to want to place a breakpoint where it throws an exception:...
Pretty-print an entire Pandas Series / DataFrame
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You can also use the option_context, with one or more options:
with pd.option_context('display.max_rows', None, 'display.max_columns', None): # more options can be specified also
print(df)
This will automatically return the options to their previous values.
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