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How to replace an entire line in a text file by line number
...k:
sed -i 'Ns/.*/replacement-line/' file.txt
where N should be replaced by your target line number. This replaces the line in the original file. To save the changed text in a different file, drop the -i option:
sed 'Ns/.*/replacement-line/' file.txt > new_file.txt
...
How to sort git tags by version string order of form rc-X.Y.Z.W?
...pecify a sorting order!
See commit b6de0c6, from commit 9ef176b, authored by Nguyễn Thái Ngọc Duy (pclouds):
--sort=<type>
Sort in a specific order.
Supported type is:
"refname" (lexicographic order),
"version:refname" or "v:refname" (tag names are treated as versions...
How do I create a copy of an object in PHP?
It appears that in PHP objects are passed by reference. Even assignment operators do not appear to be creating a copy of the Object.
...
Why Java needs Serializable interface?
...s breaks encapsulation.
Serialization can also lead to security problems. By being able to serialize any object it has a reference to, a class can access data it would not normally be able to (by parsing the resultant byte data).
There are other issues, such as the serialized form of inner classes...
How to checkout in Git by date?
...r you can (as carleeto said) git commit it to a separate branch.
Checkout by date using rev-parse
You can checkout a commit by a specific date using rev-parse like this:
git checkout 'master@{1979-02-26 18:30:00}'
More details on the available options can be found in the git-rev-parse.
As note...
how do I query sql for a latest record date for each user
...oin (
select username, max(date) as MaxDate
from MyTable
group by username
) tm on t.username = tm.username and t.date = tm.MaxDate
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Check if event is triggered by a human
...ttached to an event and I would like it to execute only if it is triggered by a human, and not by a trigger() method. How do I tell the difference?
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Passing arrays as parameters in bash
...y at all, but a list of its elements, which are re-assembled into an array by called_function(), but it worked for me. Somewhat later Ken posted his solution, but I kept mine here for "historic" reference.
calling_function()
{
variable="a"
array=( "x", "y", "z" )
called_function "${vari...
What is the purpose of shuffling and sorting phase in the reducer in Map Reduce Programming?
...ce() method which takes a key-list(value) input, so it has to group values by key. It's easy to do so, if input data is pre-sorted (locally) in the map phase and simply merge-sorted in the reduce phase (since the reducers get data from many mappers).
Partitioning, that you mentioned in one of the a...
C++ Erase vector element by value rather than by position? [duplicate]
and lets say the values in the vector are this (in this order):
4 Answers
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