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Singleton: How should it be used
...ee cargo cult programmer in wikipedia)
In user interface widgets
It is supposed to be a cache
In strings
In Sessions
I can go all day long
How to create the best singleton:
The smaller, the better. I am a minimalist
Make sure it is thread safe
Make sure it is never null
Make sure it is created onl...
Which terminal command to get just IP address and nothing else?
... | grep "inet " | grep -v 127.0.0.1 | cut -d\ -f2
Or for linux system
hostname -i | awk '{print $3}' # Ubuntu
hostname -i # Debian
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How to scp in Python?
What's the most pythonic way to scp a file in Python? The only route I'm aware of is
14 Answers
...
gdb fails with “Unable to find Mach task port for process-id” error
...
In Snow Leopard and later Mac OS versions, it isn't enough to codesign the gdb executable.
You have to follow this guide to make it work: http://www.opensource.apple.com/source/lldb/lldb-69/docs/code-signing.txt
The guide explains how to do it for lldb,...
stop all instances of node.js server
... /f (force) parameter to the command.
Linux machine:
The process is almost identical. You could either kill all Node processes running on the machine (use -$SIGNAL if SIGKILL is insufficient):
killall node
Or also using netstat, you can find the PID of a process listening on a port:
$ netsta...
No module named pkg_resources
...
July 2018 Update
Most people should now use pip install setuptools (possibly with sudo).
Some may need to (re)install the python-setuptools package via their package manager (apt-get install, yum install, etc.).
This issue can be highly depe...
How to recursively find the latest modified file in a directory?
...ntf is probably GNU-only, ajreals usage of stat -c is too. Although it is possible to do the same on BSD, the options for formatting is different (-f "%m %N" it would seem)
And I missed the part of plural; if you want more then the latest file, just bump up the tail argument.
...
How to list all installed packages and their versions in Python?
... :
In [1]: import #import press-TAB
Display all 631 possibilities? (y or n)
ANSI audiodev markupbase
AptUrl audioop markupsafe
ArgImagePlugin avahi marshal
BaseHTTPServer axi ...
rmagick gem install “Can't find Magick-config”
...ll with:
$ sudo apt-get install libmagickwand-dev imagemagick
or on centOs:
$ yum install ImageMagick-devel
On Mac OS, you can use Homebrew:
$ brew install imagemagick
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How do I check if a string contains another string in Objective-C?
..., 0} if the "haystack" does not contain the "needle".
And if you're on iOS 8 or OS X Yosemite, you can now do: (*NOTE: This WILL crash your app if this code is called on an iOS7 device).
NSString *string = @"hello bla blah";
if ([string containsString:@"bla"]) {
NSLog(@"string contains bla!");...