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How to remove local (untracked) files from the current Git working tree
...-X] [--] <path>…
Description
Cleans the working tree by recursively removing files that are not under version control, starting from the current directory.
Normally, only files unknown to Git are removed, but if the -x option is specified, ignored files are also removed. T...
What is the in a .vimrc file?
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The <Leader> key is mapped to \ by default. So if you have a map of <Leader>t, you can execute it by default with \+t. For more detail or re-assigning it using the mapleader variable, see
:help leader
To define a mapping which uses the "mapleader...
Is there a short cut for going back to the beginning of a file by vi editor?
When reading a long file by vi editor, it would be very nice to get back to the beginning of the file by some short cuts when you really need to do so. Even ctrl + B sometimes is too slow. Does anyone know such a tool?
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UIGestureRecognizer on UIImageView
...is very important to remember to enable user interaction on the image view by setting its userInteractionEnabled property to YES. UIImageView inherits from UIView, whose user interaction property is set to YES by default, however, UIImageView's user interaction property is set to NO by default.
Fro...
What is the difference between Trap and Interrupt?
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A trap is an exception in a user process. It's caused by division by zero or invalid memory access. It's also the usual way to invoke a kernel routine (a system call) because those run with a higher priority than user code. Handling is synchronous (so the user code is suspended ...
What is TypeScript and why would I use it in place of JavaScript? [closed]
...ethod parameters. This is removed when translating to JavaScript, but used by the IDE and compiler to spot errors, like passing a numeric type to the constructor.
It's also capable of inferring types which aren't explicitly declared, for example, it would determine the greet() method returns a stri...
MySQL - Rows to Columns
...olumns.
Step 3: group and aggregate the extended table. We need to group by hostid, since it provides the y-values:
create view history_itemvalue_pivot as (
select
hostid,
sum(A) as A,
sum(B) as B,
sum(C) as C
from history_extended
group by hostid
);
select * from history_i...
What is the meaning of “POSIX”?
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POSIX is a family of standards, specified by the IEEE, to clarify and make uniform the application programming interfaces (and ancillary issues, such as commandline shell utilities) provided by Unix-y operating systems. When you write your programs to rely on POSIX ...
How does the String class override the + operator?
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5.1.11. String Conversion
Any type may be converted to type String by string conversion.
A value x of primitive type T is first converted to a reference value
as if by giving it as an argument to an appropriate class instance
creation expression (§15.9):
If T is boolean, th...
Python Regex instantly replace groups
...erences (backslash, group number) which are replaced with what was matched by the groups. Groups are counted the same as by the group(...) function, i.e. starting from 1, from left to right, by opening parentheses.
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