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How to delete duplicate lines in a file without sorting it in Unix?
...ates to true. The ++ increments seen so that seen[$0] == 1 after the first time a line is found and then seen[$0] == 2, and so on.
Awk evaluates everything but 0 and "" (empty string) to true. If a duplicate line is placed in seen then !seen[$0] will evaluate to false and the line will not be writte...
SVN: Folder already under version control but not comitting?
...move your folder back to working directory, add it and commit. Most of the time this workaround works, it seems that basically SVN got confused...
Update: quoting comment by @Mark:
Didn't need to move the folder around, just deleting the .svn folder and then svn-adding it worked.
...
How to split a string in Java
...mpiled in advance and stored as a static member (initialised at class load time in the example). The regular expression is:
(\d+)-(\d+)
The parentheses denote the capturing groups; the string that matched that part of the regexp can be accessed by the Match.group() method, as shown. The \d matche...
How do I install cygwin components from the command line?
... Since the original project is dead, I suggest looking at this (as of the time of this comment) active fork: github.com/kou1okada/apt-cyg
– Vladimir Panteleev
Aug 19 '17 at 17:37
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How to convert a std::string to const char* or char*?
...super-set of .data()'s, you can always safely use .c_str(), but people sometimes don't because:
using .data() communicates to other programmers reading the source code that the data is not ASCIIZ (rather, you're using the string to store a block of data (which sometimes isn't even really textual))...
How to replace a character by a newline in Vim
...atim, and Ctrl-Q means that someone made the mistake of loading the $VIMRUNTIME/mswin.vim configuration file. You don't need mswin. Just use your own vimrc instead.
– 00dani
Oct 12 '16 at 4:28
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What exactly is metaprogramming?
... object.
In languages like ActionScript, you can evaluate functions at runtime to create new programs such as eval("x" + i). DoSomething() would affect an object called x1 when i is 1 and x2 when i is 2.
Finally, another common form of metaprogramming is when the program can change itself in non-t...
What are the differences between git branch, fork, fetch, merge, rebase and clone?
... pulls or fetches/pushes to a remote repository such as GitHub. The only time you need to do manual changes (actually editing a file) is if two changes involve the same line(s) of code.
Branches
Branches allow you to preserve the main code (the 'master' branch), make a copy (a new branch) and ...
What is best tool to compare two SQL Server databases (schema and data)? [duplicate]
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I have had Visual Studio 2013 crash on me multiple times while trying to use the built-in tools to sync data from our Prod database to the Test database. It works good for small batches, but when you try to sync the entire database..... well, good luck. RedGate's tool has ...
What optimizations can GHC be expected to perform reliably?
... had this:
\x -> let y = expensive in x+y
In the above lambda, every time the function is called, y is recomputed. A better function, which floating out produces, is
let y = expensive in \x -> x+y
To facilitate the process, other transformations may be applied. For example, this happens:...