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How do I set a variable to the output of a command in Bash?
...n to backticks `command`, command substitution can be done with $(command) or "$(command)", which I find easier to read, and allows for nesting.
OUTPUT=$(ls -1)
echo "${OUTPUT}"
MULTILINE=$(ls \
-1)
echo "${MULTILINE}"
Quoting (") does matter to preserve multi-line variable values; it is opti...
How and where are Annotations used in Java?
What are the major areas that we can use Annotations? Is the feature a replacement for XML based configuration?
15 Answers
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Algorithm to generate a crossword
Given a list of words, how would you go about arranging them into a crossword grid?
13 Answers
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List or IList [closed]
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Say you had originally used List<T> and wanted to change to use a specialized CaseInsensitiveList<T>, both of which implement IList<T>. If you use the concrete type all callers need to be updated. If exposed as IList<...
How does Access-Control-Allow-Origin header work?
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Access-Control-Allow-Origin is a CORS (Cross-Origin Resource Sharing) header.
When Site A tries to fetch content from Site B, Site B can send an Access-Control-Allow-Origin response header to tell the browser that the content of this page is ac...
Match whitespace but not newlines
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Perl versions 5.10 and later support subsidiary vertical and horizontal character classes, \v and \h, as well as the generic whitespace character class \s
The cleanest solution is to use the horizontal whitespace character class \h. This will match tab and ...
Get difference between two lists
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@Drewdin: Lists do not support the "-" operand. Sets, however, do, and that what is demonstrated above if you look closely.
– Godsmith
Oct 14 '14 at 21:21
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What is the difference between JSON and Object Literal Notation?
...t JSON actually is. JSON is a textual, language-independent data-exchange format, much like XML, CSV or YAML.
Data can be stored in many ways, but if it should be stored in a text file and be readable by a computer, it needs to follow some structure. JSON is one of the many formats that define such...
No == operator found while comparing structs in C++
Comparing two instances of the following struct, I receive an error:
8 Answers
8
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Test whether a glob has any matches in bash
If I want to check for the existence of a single file, I can test for it using test -e filename or [ -e filename ] .
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