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Check number of arguments passed to a Bash script
...nts are valid. It allows a single argument or two.
[[ ($# -eq 1 || ($# -eq 2 && $2 == <glob pattern>)) && $1 =~ <regex pattern> ]]
For pure arithmetic expressions, using (( )) to some may still be better, but they are still possible in [[ ]] with its arithmetic operators...
Can't install RMagick 2.13.1. Can't find MagickWand.h.
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How to read a large file - line by line?
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1288
The correct, fully Pythonic way to read a file is the following:
with open(...) as f:
for...
Find all packages installed with easy_install/pip?
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edited Nov 2 '17 at 13:31
TheodorosPloumis
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Bootstrap: How do I identify the Bootstrap version?
... bootstrap.css you should have comments like the below:
/*!
* Bootstrap v2.3.1
*
* Copyright 2012 Twitter, Inc
* Licensed under the Apache License v2.0
* http://www.apache.org/licenses/LICENSE-2.0
*
* Designed and built with all the love in the world @twitter by @mdo and @fat.
*/
If they ...
Warning: push.default is unset; its implicit value is changing in Git 2.0
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2154
It's explained in great detail in the docs, but I'll try to summarize:
matching means git p...
Scala @ operator
...variable. Consider the following, for instance:
val o: Option[Int] = Some(2)
You can easily extract the content:
o match {
case Some(x) => println(x)
case None =>
}
But what if you wanted not the content of Some, but the option itself? That would be accomplished with this:
o match {...
Move an array element from one array position to another
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How can I remove a specific item from an array?
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R: Comment out block of code [duplicate]
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Most of the editors take some kind of shortcut to comment out blocks of code. The default edito...