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What is the $? (dollar question mark) variable in shell scripting? [duplicate]
I'm trying to learn shell scripting, and I need to understand someone else's code. What is the $? variable hold? I can't Google search the answer because they block punctuation characters.
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How can I convert a dictionary into a list of tuples?
...ew" into the dictionary items. See the What's New document for Python 3.0, and the new documentation on views.
1: Insertion-order preservation for dicts was added in Python 3.7
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Showing the same file in both columns of a Sublime Text window
... -> New View Into File. You can then drag the new tab to the other pane and view the file twice.
There are several ways to create a new pane. As described in other answers, on Linux and Windows, you can use AltShift2 (Option ⌥Command ⌘2 on OS X), which corresponds to View → Layout → Colu...
“unpacking” a tuple to call a matching function pointer
.... doesn't work from the signatures: your std::make_unique expects a tuple, and a tuple can be created from an unpacked tuple only via another call to std::make_tuple. This is what I've done in the lambda (although it's highly redundant, as you can also simply copy the tuple into the unique pointer w...
How can I make SQL case sensitive string comparison on MySQL?
....com/doc/refman/5.0/en/case-sensitivity.html
The default character set and collation are latin1 and latin1_swedish_ci, so nonbinary string comparisons are case insensitive by default. This means that if you search with col_name LIKE 'a%', you get all column values that start with A or a. To mak...
Split by comma and strip whitespace in Python
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Use list comprehension -- simpler, and just as easy to read as a for loop.
my_string = "blah, lots , of , spaces, here "
result = [x.strip() for x in my_string.split(',')]
# result is ["blah", "lots", "of", "spaces", "here"]
See: Python docs on List Comp...
Why is exception handling bad?
Google's Go language has no exceptions as a design choice, and Linus of Linux fame has called exceptions crap. Why?
15 Answ...
MySQL: Large VARCHAR vs. TEXT?
... in MySQL which records messages between users. Apart from the typical ids and message types (all integer types) I need to save the actual message text as either VARCHAR or TEXT. I'm setting a front-end limit of 3000 characters which means the messages would never be inserted into the db as longer t...
Beginners Guide to Haskell? [closed]
...aven't been able to find one that seems interesting enough to read through and/or makes sense.
16 Answers
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Comparison of Lucene Analyzers
...ifferent analyzers within Lucene? I am getting a maxClauseCount exception and I understand that I can avoid this by using a KeywordAnalyzer but I don't want to change from the StandardAnalyzer without understanding the issues surrounding analyzers. Thanks very much.
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