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How can I check if a program exists from a Bash script?
...t or even hook into the package manager.
So, don't use which. Instead use one of these:
$ command -v foo >/dev/null 2>&1 || { echo >&2 "I require foo but it's not installed. Aborting."; exit 1; }
$ type foo >/dev/null 2>&1 || { echo >&2 "I require foo but it's not...
What is a method group in C#?
...
A method group is the name for a set of methods (that might be just one) - i.e. in theory the ToString method may have multiple overloads (plus any extension methods): ToString(), ToString(string format), etc - hence ToString by itself is a "method group".
It can usually convert a method gro...
Encoding an image file with base64
...d Jul 31 '14 at 19:53
Alex Zavatone
3,1763030 silver badges4545 bronze badges
answered Sep 15 '10 at 7:31
Jim ...
Apache Spark: The number of cores vs. the number of executors
...apacity
of the NodeManagers. The application master will take up a core on one
of the nodes, meaning that there won’t be room for a 15-core executor
on that node. 15 cores per executor can lead to bad HDFS I/O
throughput.
A better option would be to use --num-executors 17
--executor-cores 5 --exec...
What is the difference between shallow copy, deepcopy and normal assignment operation?
...list but inner lists are references. For the inner lists, would the copied one influenced by original one? I create a list of lists like list_=[[1,2],[3,4]] newlist = list_.copy() list_[0]=[7,8] and the newlist remains the same, so does the inner list are references?
– Alston
...
How to replace plain URLs with links?
...a terrible idea. You must imagine this is a common enough problem that someone has written, debugged and tested a library for it, according to the RFCs. URIs are complex - check out the code for URL parsing in Node.js and the Wikipedia page on URI schemes.
There are a ton of edge cases when it come...
to_string is not a member of std, says g++ (mingw)
...an "MinGW-builds" are builds of MinGW-w64, a different project to MinGW. One reason that MinGW-w64 was forked off was so they they could in fact fix bugs like the one this thread was about.
– M.M
Mar 27 '16 at 7:33
...
Meaning of -
... line below in "Learning XML", but it is still not clear, for me. Can someone point me to a book or website which explains these basics clearly?
...
.Net picking wrong referenced assembly version
... to start developing on it and have run into a problem with the version of one of my referenced assemblies (a telerik DLL as it happens).
...
Object.getOwnPropertyNames vs Object.keys
...me result.
It's easy to test:
var a = {};
Object.defineProperties(a, {
one: {enumerable: true, value: 1},
two: {enumerable: false, value: 2},
});
Object.keys(a); // ["one"]
Object.getOwnPropertyNames(a); // ["one", "two"]
If you define a property without providing property attributes descri...