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How to create a video from images with FFmpeg?
...Extended_Mix%29.ogg
cd ..
# Convert all to PNG for consistency.
# https://unix.stackexchange.com/questions/29869/converting-multiple-image-files-from-jpeg-to-pdf-format
# Hardlink the ones that are already PNG.
mkdir -p png
mogrify -format png -path png orig/*.jpg
ln -P orig/*.png png
Now we have...
What happens when a computer program runs?
...
On POSIX boxes, it's going to say:
The stack is above the heap
The UNIX memory model is quite well explained here by @Sdaz MacSkibbons, so I won't reiterate that here. But that is not the only memory model. The reason POSIX requires this model is the sbrk system call. Basically, on a POSIX b...
How to generate a random string of a fixed length in Go?
... solution we're improving is this:
func init() {
rand.Seed(time.Now().UnixNano())
}
var letterRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
func RandStringRunes(n int) string {
b := make([]rune, n)
for i := range b {
b[i] = letterRunes[rand.Intn(len(le...
Force LF eol in git repo and working copy
...
Dealing with line endings at GitHub
When using vagrant: Windows CRLF to Unix LF Issues
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Context switches much slower in new linux kernels
...
single-threaded libpthread mutex
libpthread condition variable
plain old Unix signals
I had to add
#include <stdint.h>
in order to compile, which I did with this command
g++ -O3 -o condvar-perf condvar-perf.cpp -lpthread -lrt
On kernel 2.6.32
$ ./condvar-perf 1000000
NPTL
mutex ...
Which timestamp type should I choose in a PostgreSQL database?
...is that both "WITH TIME ZONE" and "WITHOUT TIME ZONE" store the value as a unix-like absolute UTC timestamp. The difference is all in how the timestamp is displayed. When "WITH time zone" then the displayed value is the UTC stored value translated to the user's zone. When "WITHOUT time zone" the UTC...
Is quitting an application frowned upon?
...ference is that pressing back button out of your activity might leave your UNIX process lying in wait just in case the user wants to revive your application. This is really no different than a modern operating system that caches recently accessed files in memory. After you quit your windows program,...
Daylight saving time and time zone best practices [closed]
...re both in a single field.
When storing timestamps as a numeric value, use Unix time - which is the number of whole seconds since 1970-01-01T00:00:00Z (excluding leap seconds). If you require higher precision, use milliseconds instead. This value should always be based on UTC, without any time zon...
How to profile a bash shell script slow startup?
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This was published at Unix & Linux - How to adjust time command to measure a program elapsed time
– F. Hauri
Apr 28 '14 at 9:19
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What should main() return in C and C++?
...efined in <cstdlib>).
Standard C — Common Extension
Classically, Unix systems support a third variant:
int main(int argc, char **argv, char **envp) { ... }
The third argument is a null-terminated list of pointers to strings, each of which is an environment variable which has a name, an ...