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Is “argv[0] = name-of-executable” an accepted standard or just a common convention?
...uleFileNameA(NULL, pathName, (DWORD)pathNameCapacity);
}
#elif defined(__linux__) /* elif of: #if defined(_WIN32) */
#include <unistd.h>
static size_t getExecutablePathName(char* pathName, size_t pathNameCapacity)
{
size_t pathNameSize = readlink("/proc/self/exe", pathName, pathNam...
What is the difference between a 'closure' and a 'lambda'?
...ten as binding a lambda to a variable internally. In other languages, like Python, there are some (rather needless) distinctions between them, but they behave the same way otherwise.
A closure is any function which closes over the environment in which it was defined. This means that it can access v...
How do I use floating-point division in bash?
... 1/3 | node -p
octave
echo 1/3 | octave
perl
echo print 1/3 | perl
python2
echo print 1/3. | python2
python3
echo 'print(1/3)' | python3
R
echo 1/3 | R --no-save
with cleaned up output:
echo 1/3 | R --vanilla --quiet | sed -n '2s/.* //p'
ruby
echo print 1/3.0 | ruby
wcalc
ech...
Why isn't sizeof for a struct equal to the sum of sizeof of each member?
... an even number of bytes (or words) on your platform. For example in C on Linux, the following 3 structures:
#include "stdio.h"
struct oneInt {
int x;
};
struct twoInts {
int x;
int y;
};
struct someBits {
int x:2;
int y:6;
};
int main (int argc, char** argv) {
printf("oneInt=%zu...
Getting Chrome to accept self-signed localhost certificate
...hich goes onto your server) into Chrome/Chromium. (Yes, this works even on Linux.)
######################
# Become a Certificate Authority
######################
# Generate private key
openssl genrsa -des3 -out myCA.key 2048
# Generate root certificate
openssl req -x509 -new -nodes -key myCA.key -s...
Eclipse: enable assertions
...ow (if you are on Windows), or go to menu Eclipse (if you are on Mac). For Linux it might be something similar.
Go to Preferences.
Choose Java, and then Installed JREs from the left panel.
Select your JRE, and then click the Edit... button in the right panel.
In the Default VM arguments field, add...
What is the minimum I have to do to create an RPM file?
I just want to create an RPM file to distribute my Linux binary "foobar", with only a couple of dependencies. It has a config file, /etc/foobar.conf and should be installed in /usr/bin/foobar.
...
Profiling Django
..., and if my profiling middleware notices that a flag has been set, it uses Python's hotshot module like this:
def process_view(self, request, view_func, view_args, view_kwargs):
# setup things here, along with: settings.DEBUG=True
# to get a SQL dump in connection.queries
profiler...
What are file descriptors, explained in simple terms?
...archive
sleep 14726 root mem REG 8,1 2030544 137184 /lib/x86_64-linux-gnu/libc-2.27.so
sleep 14726 root mem REG 8,1 170960 137156 /lib/x86_64-linux-gnu/ld-2.27.so
sleep 14726 root 0u CHR 136,6 0t0 9 /dev/pts/6
sleep 14726 root 1u CHR 136,6 0t0 ...
Using global variables between files?
...
See Python's document on sharing global variables across modules:
The canonical way to share information across modules within a single program is to create a special module (often called config or cfg).
config.py:
...