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How to detect if a script is being sourced
...ocess $$ is $v ($0, $BASH_SOURCE)" ')
process 29301 is sourced (bash, /dev/fd/63)
bash <(echo $'#!/bin/bash
[ "$0" = "$BASH_SOURCE" ] && v=own || v=sourced;
echo "process $$ is $v ($0, $BASH_SOURCE)" ')
process 16229 is own (/dev/fd/63, /dev/fd/63)
I use source in...
How do I convert a String object into a Hash object?
...rty method would be
eval("{ :key_a => { :key_1a => 'value_1a', :key_2a => 'value_2a' }, :key_b => { :key_1b => 'value_1b' } }")
But it has severe security implications.
It executes whatever it is passed, you must be 110% sure (as in, at least no user input anywhere along the way) ...
What is the Difference Between read() and recv() , and Between send() and write()?
...ntly that when I used write() on a socket in Windows, it almost works (the FD passed to write() isn't the same as the one passed to send(); I used _open_osfhandle() to get the FD to pass to write()). However, it didn't work when I tried to send binary data that included character 10. write() somew...
How to read the content of a file to a string in C?
...actually share the physical memory.
POSIX code would look like this:
int fd = open("filename", O_RDONLY);
int len = lseek(fd, 0, SEEK_END);
void *data = mmap(0, len, PROT_READ, MAP_PRIVATE, fd, 0);
Windows on the other hand is little more tricky, and unfortunately I don't have a compiler in fron...
How to validate an Email in PHP?
...x7E]\\x22?)|(?:\\x22?[^\\x5C\\x22]\\x22?)){65,}@)(?:(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\x7E]+)|(?:\\x22(?:[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x21\\x23-\\x5B\\x5D-\\x7F]|(?:\\x5C[\\x00-\\x7F]))*\\x22))(?:\\.(?:(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\...
Difference between 3NF and BCNF in simple terms (must be able to explain to an 8-year old)
...quivalent to Codd's:
A relation, R, is in 3NF iff for every nontrivial FD (X->A) satisfied
by R at least ONE of the following conditions is true:
(a) X is a superkey for R, or
(b) A is a key attribute for R
BCNF requires (a) but doesn't treat (b) as a special case of its own. In...
How do I get a string format of the current date time, in python?
... date=datetime.datetime.now() )
)
d = datetime.datetime.now()
print( "2a: {:%B %d, %Y}".format(d))
# see the f" to tell python this is a f string, no .format
print(f"2b: {d:%B %d, %Y}")
print(f"3: Today is {datetime.datetime.now():%Y-%m-%d} yay")
1: test-2018-02-14_16:40:52.txt
2a: March 0...
What's the best way to check if a file exists in C?
...itions, then use this:
#include <fcntl.h>
#include <errno.h>
fd = open(pathname, O_CREAT | O_WRONLY | O_EXCL, S_IRUSR | S_IWUSR);
if (fd < 0) {
/* failure */
if (errno == EEXIST) {
/* the file already existed */
...
}
} else {
/* now you can use the file */
}
...
How to reset Jenkins security settings from the command line?
...l) and update the contents of passwordHash:
<passwordHash>#jbcrypt:$2a$10$razd3L1aXndFfBNHO95aj.IVrFydsxkcQCcLmujmFQzll3hcUrY7S</passwordHash>
Once you have done this, just restart Jenkins and log in using this password:
test
...
Do sealed classes really offer performance Benefits?
... ecx,183994h (MT: ScratchConsoleApplicationFX4.NormalClass)
003c00b8 e8631fdbff call 00172020 (JitHelp: CORINFO_HELP_NEWSFAST)
003c00bd e80e70106f call mscorlib_ni+0x2570d0 (6f4c70d0) (System.Console.get_Out(), mdToken: 060008fd)
003c00c2 8bc8 mov ecx,eax
003c00c4 8b1...