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How to profile a bash shell script slow startup?
...another version that can output nanoseconds), do this at the beginning of /etc/bash.bashrc (or wherever you'd like to begin a trace in any Bash script):
PS4='+ $(date "+%s.%N")\011 '
exec 3>&2 2>/tmp/bashstart.$$.log
set -x
add
set +x
exec 2>&3 3>&-
at the end of ~/.bas...
Setting an object to null vs Dispose()
...y resources). These could be UI handles, network connections, file handles etc. These are limited resources, so you generally want to release them as soon as you can. You should implement IDisposable whenever your type "owns" an unmanaged resource, either directly (usually via an IntPtr) or indirect...
Automatic Retina images for web sites
...bsite is designed, what kind of technology your typical visitors are using etc. Note that retina displays are not limited to the Macbook Pro Retina and the coming iMacs, but also include mobile devices, which may have their own needs.
The problem is also closely related to images in responsive desi...
Simpler way to put PDB breakpoints in Python code?
...ork alright. Most other 'simple' programmers editors (emacs, sublimetext, etc) should have similar easy ways to do this.
Edit:
I actually have:
au FileType python map <silent> <leader>b oimport pdb; pdb.set_trace()<esc>
au FileType python map <silent> <leader>B Oimpo...
Asynchronous vs Multithreading - Is there a difference?
... to other work while the I/O hardware (disk controller, network interface, etc.) does the I/O work. The hardware lets the CPU know when it's finished by interrupting the CPU, and the OS then delivers the event to your application.
Frequently higher-level abstractions and APIs don't expose the unde...
.keyCode vs. .which
...nly. your event.wich || ... test for falsy (undefined, null, false, 0, '', etc)
– aMarCruz
May 22 '15 at 11:54
@aMarCr...
Wolfram's Rule 34 in XKCD [closed]
...ts neighbors match rule 1 above, it turns black/positive/1/true/whatever`, etc. etc. until you see that, for rule 110, if a cell and its neighbors match rules 1,2,3,5,6, then the cell turns black. Otherwise, it turns white. A while back, I wrote some JS code to allow me to play around with these uni...
What are the most common naming conventions in C?
...typically are in lower case (in my experience) rather than the C++/Java/C#/etc convention of making the first letter a capital but I guess it's possible in C too.
C++ is more complex. I've seen a real mix here. Camel case for class names or lowercase+underscores (camel case is more common in my ex...
AWS Difference between a snapshot and AMI
... of specific EBS volume, it might be any volume (Root volume, data volume, etc.)
AMI (Amazon Machine Image) is a backup of Entire EC2 instance. For example, with proper configuration it's possible to create AMI which includes multiple EBS volumes.
Now, it might sound confusing, but they are both s...
How can I add an empty directory to a Git repository?
...
You can read "it's impossible, you can't, etc." all over the Internet for this frequent question. The .gitignore trick is a frequent answer, and satisfies many needs. However it IS possible to make git track an truly empty directory, see my answer
...