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Bash command to sum a column of numbers [duplicate]
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Using existing file:
paste -sd+ infile | bc
Using stdin:
<cmd> | paste -sd+ | bc
Edit:
With some paste implementations you need to be more explicit when reading from stdin:
<cmd> | paste -sd+ - | bc
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Correct format specifier to print pointer or address?
...on is in §7.21.6.1 ¶8.)
On some platforms, that will include a leading 0x and on others it won't, and the letters could be in lower-case or upper-case, and the C standard doesn't even define that it shall be hexadecimal output though I know of no implementation where it is not.
It is somewhat op...
Semicolon before self-invoking function? [duplicate]
...ach in few popular jQuery plugins and I'm curious to find if this is the next awesome thing in JavaScript that I don't know.
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Computational complexity of Fibonacci Sequence
...ons. In particular, I've been trying to figure out the computational complexity of the naive version of the Fibonacci sequence:
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What does a b prefix before a python string mean?
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This is Python3 bytes literal. This prefix is absent in Python 2.5 and older (it is equivalent to a plain string of 2.x, while plain string of 3.x is equivalent to a literal with u prefix in 2.x). In Python 2.6+ it is equivalent to a plain string, for compatibility ...
How do you extract a column from a multi-dimensional array?
Does anybody know how to extract a column from a multi-dimensional array in Python?
20 Answers
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Nginx 403 forbidden for all files
I have nginx installed with PHP-FPM on a CentOS 5 box, but am struggling to get it to serve any of my files - whether PHP or not.
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Declare and Initialize String Array in VBA
...d 3) VBA doesn't have String array initializer. But you can use Split for example.
– Eldar Agalarov
Apr 18 '16 at 20:28
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Simple logical operators in Bash
...all.
(…) parentheses indicate a subshell. What's inside them isn't an expression like in many other languages. It's a list of commands (just like outside parentheses). These commands are executed in a separate subprocess, so any redirection, assignment, etc. performed inside the parentheses has ...
Difference between Lookup() and Dictionary(Of list())
...esent in a lookup, you get an empty sequence back instead of a KeyNotFoundException. (Hence there's no TryGetValue, AFAICR.)
They're likely to be equivalent in efficiency - the lookup may well use a Dictionary<TKey, GroupingImplementation<TValue>> behind the scenes, for example. Choose...