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Delete empty lines using sed
... spaces or tabs in your "empty" line. Use POSIX classes with sed to remove all lines containing only whitespace:
sed '/^[[:space:]]*$/d'
A shorter version that uses ERE, for example with gnu sed:
sed -r '/^\s*$/d'
(Note that sed does NOT support PCRE.)
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How to create a self-signed certificate for a domain name for development?
...poses. My web application solution contains a web API etc, that I need to call from external systems, hence I am not using localhost.
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How to do a LIKE query in Arel and Rails?
...|
edited Feb 15 '16 at 17:11
answered Aug 10 '11 at 14:46
P...
Colors in JavaScript console
...est: background: #444; color: #bada55; padding: 2px; border-radius:2px its all about the border-radius
– Nick Sotiros
Apr 30 '14 at 7:08
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Warning the user/local/mysql/data directory is not owned by the mysql user
... KronosKronos
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String slugification in Python
... named python-slugify, which does a pretty good job of slugifying:
pip install python-slugify
Works like this:
from slugify import slugify
txt = "This is a test ---"
r = slugify(txt)
self.assertEquals(r, "this-is-a-test")
txt = "This -- is a ## test ---"
r = slugify(txt)
self.assertEquals(r, "thi...
How are msys, msys2, and msysgit related to each other?
...though it does that very well). It has a software building infrastructure called makepkg that allows the creation of recipes (PKGBUILD and patch files) for building software.
IMHO, the adoption of Pacman changes things significantly for open source development on Windows. Instead of everyone hackin...
What is Objective C++? [closed]
...eatures to C++ classes. For example, you cannot use Objective-C syntax to call a C++ object, you cannot add constructors or destructors to an Objective-C object, and you cannot use the keywords this and self interchangeably. The class hierarchies are separate; a C++ class cannot inherit from an Obje...
Getting “bytes.Buffer does not implement io.Writer” error message
...s. :)
– Nelo Mitranim
Nov 16 '14 at 11:32
7
@hourback it has to do with the way the interface is ...
What are free monads?
...r monad, and the second one gives you a way to "get out" of it.
More generally, if X is a Y with some extra stuff P, then a "free X" is a a way of getting from a Y to an X without gaining anything extra.
Examples: a monoid (X) is a set (Y) with extra structure (P) that basically says it has an ope...