大约有 47,000 项符合查询结果（耗时：0.0289秒） [XML]
postgresql port confusion 5433 or 5432?
...instances running so make sure you're connecting to the right one by using select version() and SHOW data_directory;.
You can also specify a unix socket directory; check the unix_socket_directories setting of the PostgreSQL instance you wish to connect to and specify that with psql -h, e.g.psql -h...
What are the differences between poll and select?
I am referring to the POSIX standard select and poll system C API calls.
3 Answers
...
Failed to build gem native extension (installing Compass)
...l the Xcode Command Line Tools this is the key to install Compass.
xcode-select --install
Installing the Xcode Command Line Tools are the key to getting Compass working on OS X
3. Install Compass
sudo gem install compass
...
Why and not taking font-family and font-size from body?
...es if you want to change their font/text styles - should be easy enough by selecting them though, as you've just done.
As far as I know, only form elements are affected. Off the top of my head: input, button, textarea, select.
...
Download the Android SDK components for offline install
...p) folder/directory in your offline machine.
Now start the SDK manager and select the package which you have paste in temp and click Install package button. Your package has been installed.
Restart your eclipse and AVD manager to get new packages.
Note:- if you are downloading sdk-tools or sdk pla...
Increasing (or decreasing) the memory available to R processes
...program
icon (the icon on your desktop or in
your programs directory). Select
``Properties'', and then select the
``Shortcut'' tab. Look for the
``Target'' field and after the closing
quotes around the location of the R
executible, add
--max-mem-size=500M
as shown in the fig...
Switching between GCC and Clang/LLVM using CMake
...sudo update-alternatives --config c++
Will print something like this:
Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/bin/g++ 20 auto mode
1 /usr/bin/clang++ 10 manual mode
2 ...
Check whether a path is valid in Python without creating a file at the path's target
...rno.ERANGE. (This appears to be an OS-level bug, otherwise referred to as "selective interpretation" of the POSIX standard.)
Under all other OSes, errno.ENAMETOOLONG.
Crucially, this implies that only pathnames residing in existing directories are validatable. The os.stat() and os.lstat() functi...
Wrapping chained method calls on a separate line in Eclipse for Java
...ormatter → Edit → Line wrapping (tab)
Then, in the list at the left, select:
Function Calls → Qualified invocations
Now below this list, set Line wrapping policy to:
Wrap all elements, except first element if not necessary
Check:
Force split, even if line shorter than maximu...
Bash command to sum a column of numbers [duplicate]
... With bc -l you can even add up float numbers. With cut you can select columns from the input: cat input.txt | cut -d ' ' -f 8 | paste -sd+ | bc -l will add all float numbers in column 8 of the input (space being the field separator).
– Arne
Sep 24 '...