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Allowed characters in filename [closed]
Where can I find a list of allowed characters in filenames, depending on the operating system?
(e.g. on Linux, the character : is allowed in filenames, but not on Windows)
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Concatenating null strings in Java [duplicate]
Why does the following work? I would expect a NullPointerException to be thrown.
5 Answers
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In CSS what is the difference between “.” and “#” when declaring a set of styles?
...arget multiple elements with a particular class. To put it another way:
#foo {} will style the single element declared with an attribute id="foo"
.foo {} will style all elements with an attribute class="foo" (you can have multiple classes assigned to an element too, just separate them with spaces,...
如何获取IE (控件)的所有链接（包括Frameset, iframe） - 其他 - 清泛IT社...
来源：新浪博客
IE 顶层 body 节点通过IHTMLElement->get_all 方法无法获取iframe 里面的节点列表：
CComPtr<IHTMLElement> body;
...
CComPtr<IDispatch> spDispCollection;
body->get_all(&spDispCollection);复制代码所以要获取iframe/frame(frameset) ...
Access data in package subdirectory
...sing files within packages that do not have slashes in their names, i.e.
foo/
__init__.py
module1.py
module2.py
data/
data.txt
data2.txt
i.e. you could access data2.txt inside package foo with for example
importlib.resources.open_binary('foo', 'data2.txt')
but it...
How to get just one file from another branch
... useful to avoid conflict with branch names. For example, git checkout -- foo means "check out file foo from HEAD" (ie. overwrite local changes in foo, ie. a subset of git reset --hard), but git checkout foo could mean that or "let's go to branch foo".
– Alois Mahdal
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Retrieving parameters from a URL
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Python 2:
import urlparse
url = 'http://foo.appspot.com/abc?def=ghi'
parsed = urlparse.urlparse(url)
print urlparse.parse_qs(parsed.query)['def']
Python 3:
import urllib.parse as urlparse
from urllib.parse import parse_qs
url = 'http://foo.appspot.com/abc?def=gh...
How to show line number when executing bash script
...on currently executing).
For example, if your script reads:
$ cat script
foo=10
echo ${foo}
echo $((2 + 2))
Executing it thus would print line numbers:
$ PS4='Line ${LINENO}: ' bash -x script
Line 1: foo=10
Line 2: echo 10
10
Line 3: echo 4
4
http://wiki.bash-hackers.org/scripting/debuggingti...
PostgreSQL - how to quickly drop a user with existing privileges
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Doing: CREATE TABLE foo(bar SERIAL); ALTER TABLE foo OWNER TO postgres; CREATE USER testuser; GRANT ALL ON foo TO testuser; DROP USER testuser gave the error messages: ERROR: role "testuser" cannot be dropped because some objects depend on it...
How can I grep hidden files?
...e with this output format:
File path:Line number:line with coincidence
./foo/bar:42:search line
./foo/.bar:42:search line
./.foo/bar:42:search line
./.foo/.bar:42:search line
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