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unix - head AND tail of file
... simply:
(head; tail) < file.txt
And if you need to uses pipes for some reason then like this:
cat file.txt | (head; tail)
Note: will print duplicated lines if number of lines in file.txt is smaller than default lines of head + default lines of tail.
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Transposing a 2D-array in JavaScript
I've got an array of arrays, something like:
23 Answers
23
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How many spaces will Java String.trim() remove?
... I had to down-vote as this answer does not cover what the documentation means by "whitespace". It would seem logical that it would be where Chararacter.isWhitespace is true, but that is not what it means by "whitespace" ..
– user2864740
Nov 30 '13 ...
join list of lists in python [duplicate]
... no need to list() it! for item in itertools.chain(*a): do somethign with item
– hasen
Apr 4 '09 at 8:42
14
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Why is the time complexity of both DFS and BFS O( V + E )
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According to your answer, won't the complexity become O(V+2E)? Since every edge might have a common edge with another edge?
– karansky
Apr 30 '17 at 9:17
2
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Numpy: Get random set of rows from 2D array
I have a very large 2D array which looks something like this:
7 Answers
7
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Basic http file downloading and saving to disk in python?
... question. However, I'm a beginner and I find it difficult to understand some of the solutions. I need a very basic solution.
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How do I check if string contains substring? [duplicate]
I have a shopping cart that displays product options in a dropdown menu and if they select "yes", I want to make some other fields on the page visible.
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What linux shell command returns a part of a string? [duplicate]
...e any command that can be used for this purpose. I want to be able to do something like this...
substr "abcdefg" 2 3 - prints cde .
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How do I remove a single file from the staging area (undo git add)?
...tory (folder) from the staging area, use
git reset HEAD -- <directoryName>
Your modifications will be kept. When you run git status the file will once again show up as modified but not yet staged.
See the git reset man page for details.
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