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Difference between passing array and array pointer into function in C
... the first element of an array with at least as many
elements as specified by the size expression.
So, in short, any function parameter declared as T a[] or T a[N] is treated as though it were declared T *a.
So, why are array parameters treated as though they were declared as pointers? Here's ...
Make xargs execute the command once for each line of input
...ashion (excluding GNU extensions) is -0, which splits the input around NUL bytes.
Then, it's just a matter of translating newlines to NUL with the help of tr:
$ echo $'one \ntwo\nthree and four' | tr '\n' '\0' | xargs -0 ./show
-> "one " "two" "three and four"
Now the argument parsing looks...
Show just the current branch in Git
...ler approach: git branch --show-current.
See commit 0ecb1fc (25 Oct 2018) by Daniels Umanovskis (umanovskis).
(Merged by Junio C Hamano -- gitster -- in commit 3710f60, 07 Mar 2019)
branch: introduce --show-current display option
When called with --show-current, git branch will print the...
How to enter command with password for git pull?
... unencrypted passwords changes with Git 2.5+ (Q2 2014).
See commit 17c7f4d by Junio C Hamano (gitster)
credential-xdg
Tweak the sample "store" backend of the credential helper to honor XDG configuration file locations when specified.
The doc now say:
If not specified:
credenti...
Handling very large numbers in Python
...l work as normal.
The int value is unlimited.
Careful when doing division, by default the quotient is turned into float, but float does not support such large numbers. If you get an error message saying float does not support such large numbers, then it means the quotient is too large to be stored i...
Is there a method that calculates a factorial in Java?
...*= factor;
}
return result;
}
}
Big Numbers version by HoldOffHunger:
public static BigInteger factorial(BigInteger number) {
BigInteger result = BigInteger.valueOf(1);
for (long factor = 2; factor <= number.longValue(); factor++) {
result = result.multipl...
Git repository broken after computer died
...
Start by following the steps suggested in Recovering broken git repository:
check whether .git/refs still contains anything useful
check git reflog and failing that the contents of .git/logs/refs/heads/master or whatever branch y...
Display filename before matching line
...match, but it will leave the file name out in case of a single input file. By using /dev/null as an extra input file grep "thinks" it dealing with multiple files, but /dev/null is of course empty, so it will not show up in the match list..
– Scrutinizer
Mar 18 ...
A non-blocking read on a subprocess.PIPE in Python
...us IO -- asyncio module.
The approach is similar to twisted-based answer by @Bryan Ward -- define a protocol and its methods are called as soon as data is ready:
#!/usr/bin/env python3
import asyncio
import os
class SubprocessProtocol(asyncio.SubprocessProtocol):
def pipe_data_received(self,...
pandas read_csv and filter columns with usecols
...
The answer by @chip completely misses the point of two keyword arguments.
names is only necessary when there is no header and you want to specify other arguments using column names rather than integer indices.
usecols is supposed to p...