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What does it mean in shell when we put a command inside dollar sign and parentheses: $(command)
... of the $ like ${HOME} gives the value of HOME. Usage of the $ like $(echo foo) means run whatever is inside the parentheses in a subshell and return that as the value. In my example, you would get foo since echo will write foo to standard out
...
Escape double quotes in parameter
...ers instead, then escape them with a caret, too.
If you want your program foo to receive the command line text "a\"b c" > d and redirect its output to file out.txt, then start your program as follows from the Windows command shell:
foo ^"a\^"b c^" ^> d > out.txt
If foo interprets \" as ...
How do I forward declare an inner class? [duplicate]
...want, but here is a workaround, if you are willing to use templates:
// Foo.h
struct Foo
{
export template<class T> void Read(T it);
};
// Foo.cpp
#include "Foo.h"
#include "Container.h"
/*
struct Container
{
struct Inner { };
};
*/
export template<>
void Foo::Read<...
Git: can't undo local changes (error: path … is unmerged)
... the file, then checkout, to revert local changes.
Try this:
$ git reset foo/bar.txt
$ git checkout foo/bar.txt
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Extract every nth element of a vector
...ady mentioned) is to use a short logical vector and use vector recycling:
foo[ c( rep(FALSE, 5), TRUE ) ]
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UNIX export command [closed]
...t are marked for export. If you set a variable at the command-line like
$ FOO="bar"
That variable will not be visible in child processes. Not unless you export it:
$ export FOO
You can combine these two statements into a single one in bash (but not in old-school sh):
$ export FOO="bar"
Here...
Rails - link_to helper with data-* attribute [duplicate]
... in... Rails has a default :data hash
= link_to body, url, :data => { :foo => 'bar', :this => 'that' }
One gotcha - you must surround symbols with quotes if they include a dash:
:data => { :'foo-bar' => 'that' }
Update: In Rails 4, underscores are automatically converted to dash...
When and why should I use a namedtuple instead of a dictionary? [duplicate]
...nces of a class like:
class Container:
def __init__(self, name, date, foo, bar):
self.name = name
self.date = date
self.foo = foo
self.bar = bar
mycontainer = Container(name, date, foo, bar)
and not change the attributes after you set them in __init__, you cou...
设置用户默认权限 Umask命令详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...后演示的方便性，先在Windows上用7-zip创建两个文件：
foo.zip（包括：目录foo_dir，文件foo_file）
bar.tar（包括：目录bar_dir，文件bar_file）
当然，你可以不用Windows，我之所以这样做，只是为了稍后抖个包袱而已。
把这两个文件...
How do I tell Git to ignore everything except a subdirectory?
... examples says:
Example to exclude everything except a specific directory foo/bar (note the /* - without the slash, the wildcard would also exclude everything within foo/bar):
$ cat .gitignore
# exclude everything except directory foo/bar
/*
!/foo
/foo/*
!/foo/bar
For an explanation about the le...