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Linux command (like cat) to read a specified quantity of characters
...1
Note that, if you want to specify the input file name, dd has old-fashioned argument parsing, so you would do:
dd count=5 bs=1 if=filename
Note also that dd verbosely announces what it did, so to toss that away, do:
dd count=5 bs=1 2>&-
or
dd count=5 bs=1 2>/dev/null
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How can I get form data with JavaScript/jQuery?
Is there a simple, one-line way to get the data of a form as it would be if it was to be submitted in the classic HTML-only way?
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How can I unstage my files again after making a local commit?
...reset HEAD^1" or "reset HEAD~" or "reset HEAD^"-- all reference HEAD minus one.
Which is the better symbol, ~ or ^? Think of the ~ tilde as a single stream -- when each commit has a single parent and it's just a series of changes in sequence, then you can reference back up the stream using the t...
Code Golf: Lasers
...e, the tr is written in the form y''' which allows me to skip backslashing one backslash.
die "true\n" if />x/; die "false\n" if />#/;
Terminate with the right message if we hit the target or a wall.
$s = $1 if s/>(.)/$s$d{$1}/;
If there's an empty space in front of the laser, move fo...
In CSS what is the difference between “.” and “#” when declaring a set of styles?
...element and what are the semantics that come into play when deciding which one to use?
9 Answers
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What does int argc, char *argv[] mean?
...efined versions. So, they're not exactly non-conforming. The most common one is envp, which is so well-known in both C and C++ that it's literally the very first entry in section J.5 (Common extensions) of the C standard.
– Justin Time - Reinstate Monica
Jan ...
Using an ORM or plain SQL? [closed]
...ate and time types to the appropriate database type. They generally handle one-to-many relationships pretty elegantly as well by instantiating nested objects. I've found if you design your database with the strengths and weaknesses of the ORM in mind, it saves a lot of work in getting data in and ou...
When to use reinterpret_cast?
...einterpret_cast. And in C++03 a cast of int* to void* was forbidden to be done with reinterpret_cast (although compilers did not implement that and it was impractical, hence was changed for C++11).
– Johannes Schaub - litb
Oct 28 '11 at 23:20
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How to extract the decision rules from scikit-learn decision-tree?
... is no need to have multiple if statements in the recursive function, just one is fine.
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How do I check if a string is unicode or ascii?
...on 2.x,
Most people seem to be using an if statement that has two checks. one for str and one for unicode.
If you want to check if you have a 'string-like' object all with one statement though, you can do the following:
isinstance(x, basestring)
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