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How to extract the first two characters of a string in shell scripting?
...head will give you the first two characters of the entire input
The third one uses the awk sub-string function to extract the first two characters and the fourth uses sed capture groups (using () and \1) to capture the first two characters and replace the entire line with them. They're both similar...
glob exclude pattern
...you use a glob in the directory name then you'd have a point, then at most one os.listdir() result is kept in memory as you iterate. But somepath/*.txt has to read all filenames in one directory in memory, then reduce that list down to only those that match.
– Martijn Pieters...
Is it wrong to use Deprecated methods or classes in Java?
...e definition of deprecated:
A program element annotated @Deprecated is one that programmers are discouraged from using, typically because it is dangerous, or because a better alternative exists.
The method is kept in the API for backward compatibility for an unspecified period of time, and may...
Is using 'var' to declare variables optional? [duplicate]
...variable. However, it can still be deleted with delete (most likely by someone else's code who also failed to use var). If you use var in the global scope, the variable is truly global and cannot be deleted.
This is, in my opinion, one of the most dangerous issues with javascript, and should be dep...
How to access command line arguments of the caller inside a function?
...function argv {
for a in ${BASH_ARGV[*]} ; do
echo -n "$a "
done
echo
}
function f {
echo f $1 $2 $3
echo -n f ; argv
}
function g {
echo g $1 $2 $3
echo -n g; argv
f
}
f boo bar baz
g goo gar gaz
Save in f.sh
$ ./f.sh arg0 arg1 arg2
f boo bar baz
farg2 ar...
What is Haskell used for in the real world? [closed]
...e ObjectOrientedProgramming is modular in the dimension of different
components.
The ability to have your cake and eat it. Imagine you have a complex OO system processing messages - every component might make state
changes depending on the message and then forward the message to some
objects...
How to simulate a higher resolution screen? [closed]
...
In the chance that it helps anyone, Here's the sample code to do what @Cody Crumrine suggested and is Genius!! <iframe src="site to test.com" width="1024" height="768"></iframe>
– Stuart
Mar 21 '17 at 13:...
How do I create a class instance from a string name in ruby?
...
module One
module Two
class Three
def say_hi
puts "say hi"
end
end
end
end
one = Object.const_get "One"
puts one.class # => Module
three = One::Two.const_get "Three"
puts three.class # => Cl...
Image comparison - fast algorithm
...rmation than others (particularly at edges and corners), and these are the ones you'll want to use for smart image matching. Google "keypoint extraction" and "keypoint matching" and you'll find quite a few academic papers on the subject. These days, SIFT keypoints are arguably the most popular, si...
Maven: Failed to read artifact descriptor
I am hoping someone can help me with a problem I am struggling with.
25 Answers
25
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