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Delete specific line number(s) from a text file using sed?
I want to delete one or more specific line numbers from a file. How would I do this using sed?
6 Answers
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Ball to Ball Collision - Detection and Handling
...re the velocities after the collision, and u1, u2 are from before):
If the balls have the same mass then the velocities are simply switched. Here's some code I wrote which does something similar:
void Simulation::collide(Storage::Iterator a, Storage::Iterator b)
{
// Check whether there ...
Why can't I use a list as a dict key in python?
...ists Can't Be Dictionary Keys. As explained there:
What would go wrong if you tried to use lists as keys, with the hash as, say, their memory location?
It can be done without really breaking any of the requirements, but it leads to unexpected behavior. Lists are generally treated as if their v...
Best way to compare two complex objects
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For value types, you can typically just call their Equals method. Even if the fields or properties were never explicitly assigned, they would still have a default value.
For reference types, you should first call ReferenceEquals, which checks for reference equality – this would serve as an ef...
What will happen if I modify a Python script while it's running?
...magine a python script that will take a long time to run, what will happen if I modify it while it's running? Will the result be different?
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When to throw an exception?
...a function which is supposed to examine an arbitrary class and return true if that class inherits from List<>. This function asks the question, "Is this object a descendant of List?" This function should never throw an exception, because there are no gray areas in its operation - every single ...
When should I use the HashSet type?
...sh what its members are, and to check whether an item is a member.
Asking if you can retrieve a single element (e.g. set[45]) is misunderstanding the concept of the set. There's no such thing as the 45th element of a set. Items in a set have no ordering. The sets {1, 2, 3} and {2, 3, 1} are iden...
OS X Bash, 'watch' command
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I believe watch only shows the first screenful of output. If you want to do something similar, change your_command to your_command 2>&1|head -10
– Mark Eirich
Nov 10 '13 at 15:36
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How does TransactionScope roll back transactions?
...base connections. When you open a DB connection the connections will looks if there is an ambient transaction (Transaction Scope) and if so enlist with it. Caution if there are more the one connection to the same SQL server this will escalate to a Distribtued Transaction.
What happens since you're...
EditText maxLines not working - user can still input more lines than set
...lies the maximum number of lines that should be possible with an editText. If I just wanted a specific height I'd use "lines". :-/
– Someone Somewhere
Apr 29 '14 at 19:03
add ...