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get just the integer from wc in bash
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You can use the cut command to get just the first word of wc's output (which is the line or word count):
lines=`wc -l $f | cut -f1 -d' '`
words=`wc -w $f | cut -f1 -d' '`
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Error while installing json gem 'mkmf.rb can't find header files for ruby'
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For Xcode 11 on macOS 10.14, this can happen even after installing Xcode and installing command-line tools and accepting the license with
sudo xcode-select --install
sudo xcodebuild -license accept
The issue is that Xcode 11 ships the macOS 10.15 SDK which includes headers for ruby2.6, but no...
Rebuild IntelliJ project indexes
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File -> Invalidate caches...
(Force rebuild of all caches and indices on next startup)
Restart IntelliJ IDEA.
Caution: This might Remove local history.
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matplotlib.pyplot will not forget previous plots - how can I flush/refresh?
...after every plt.show() to just clear the current figure instead of closing and reopening it, keeping the window size and giving you a better performance and much better memory usage.
Similarly, you could do plt.cla() to just clear the current axes.
To clear a specific axes, useful when you have mu...
How to get a URL parameter in Express?
...hich version of express are you using? I just tested this on express-3.4.4 and it works fine.
– maček
Nov 20 '13 at 7:20
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UnicodeDecodeError: 'ascii' codec can't decode byte 0xd1 in position 2: ordinal not in range(128)
I am attempting to work with a very large dataset that has some non-standard characters in it. I need to use unicode, as per the job specs, but I am baffled. (And quite possibly doing it all wrong.)
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How to write an XPath query to match two attributes?
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//div[@id='..' and @class='...]
should do the trick. That's selecting the div operators that have both attributes of the required value.
It's worth using one of the online XPath testbeds to try stuff out.
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Why doesn't Java allow generic subclasses of Throwable?
...; e) {
// ignore that
} catch (SomeException<String> e) {
crashAndBurn()
}
Both SomeException<Integer> and SomeException<String> are erased to the same type, there is no way for the JVM to distinguish the exception instances, and therefore no way to tell which catch block s...
python re.sub group: number after \number
...r')
Relevant excerpt from the docs:
In addition to character escapes and
backreferences as described above,
\g will use the substring
matched by the group named name, as
defined by the (?P...) syntax.
\g uses the corresponding
group number; \g<2> is therefore
equivalent to ...
How to initialize an array in Java?
...tic void product(int[] array){ int[] productArray = new int[array.length]; and want to set all the values of productArray zero, what should I write? (I think I should write a loop and set all values to zero, is there any better way to do this?)
– Hengameh
Aug 2...