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What is an OS kernel ? How does it differ from an operating system? [closed]
...ernel is an operating system in that sense.
The end-user definition is usually something around "a software package that provides a desktop, shortcuts to applications, a web browser and a media player". A kernel doesn't match that definition.
So for an end-user a Linux distribution (say Ubuntu) is...
How to run a python script from IDLE interactive shell?
...ipt name
execfile('helloworld.py')
Deprecated since 2.6: popen
import os
os.popen('python helloworld.py') # Just run the program
os.popen('python helloworld.py').read() # Also gets you the stdout
With arguments:
os.popen('python helloworld.py arg').read()
Advance usage: subprocess
impor...
libpng warning: iCCP: known incorrect sRGB profile
...geMagick's
convert in.png out.png
To remove the invalid iCCP chunk from all of the PNG files in a folder (directory), you can use mogrify from ImageMagick:
mogrify *.png
This requires that your ImageMagick was built with libpng16. You can easily check it by running:
convert -list format | gre...
Error executing command 'ant' on Mac OS X 10.9 Mavericks when building for Android with PhoneGap/Cor
...h of Mac OS X Mavericks anymore.
Bulletproof solution:
Download and install Homebrew by executing following command in terminal:
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Install Apache Ant via Homebrew by executing
brew install ant
Run...
How to fix a locale setting warning from Perl?
...cale failed.
perl: warning: Please check that your locale settings:
LC_ALL = (unset),
LANG = "en_US.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
My guess is you used ssh to connect to this older host from a newer desktop ma...
How can I use threading in Python?
...ticle/blog post that you should definitely check out (no affiliation) - Parallelism in one line: A Better Model for Day to Day Threading Tasks. I'll summarize below - it ends up being just a few lines of code:
from multiprocessing.dummy import Pool as ThreadPool
pool = ThreadPool(4)
results = pool.m...
Using awk to remove the Byte-order mark
...
Using GNU sed (on Linux or Cygwin):
# Removing BOM from all text files in current directory:
sed -i '1 s/^\xef\xbb\xbf//' *.txt
On FreeBSD:
sed -i .bak '1 s/^\xef\xbb\xbf//' *.txt
Advantage of using GNU or FreeBSD sed: the -i parameter means "in place", and will update files ...
What's an easy way to read random line from a file in Unix command line?
...
You can use shuf:
shuf -n 1 $FILE
There is also a utility called rl. In Debian it's in the randomize-lines package that does exactly what you want, though not available in all distros. On its home page it actually recommends the use of shuf instead (which didn't exist when it was cr...
Is git not case sensitive?
In the first commitment of my partial called _Electronics it was written beginning with a capital letters, then I changed it to _electronics .
...
Is there a way to iterate over a dictionary?
...ere you need a key in order to get a value . But how can I iterate over all keys and values in a NSDictionary , so that I know what keys there are, and what values there are? I know there is something called a for-in-loop in JavaScript . Is there something similar in Objective-C ?
...