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When do we need curly braces around shell variables?
...ambiguous cases, can be considered good programming practice. This is both for consistency and to avoid surprises like $foo_$bar.jpg, where it's not visually obvious that the underscore becomes part of the variable name.
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Calling shell functions with xargs
...ted out by @Sasha.
Here is an example why you should not use the embedded format:
$ echo '$(date)' | xargs -I {} bash -c 'echo_var "{}"'
Sun Aug 18 11:56:45 CDT 2019
Another example of why not:
echo '\"; date\"' | xargs -I {} bash -c 'echo_var "{}"'
This is what is output using the safe forma...
Change MySQL default character set to UTF-8 in my.cnf?
...tf8'
character-set-server = utf8
If you want to change the character set for an existing DB, let me know... your question didn't specify it directly so I am not sure if that's what you want to do.
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Where are $_SESSION variables stored?
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Excellent answer! I was searching for the question: "Why do sessions expire after deleting browser cache?". And you saved my day.
– Pupil
Jun 17 '13 at 7:50
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How can I search for a multiline pattern in a file?
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Why don't you go for awk:
awk '/Start pattern/,/End pattern/' filename
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Cast Int to enum in Java
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Try MyEnum.values()[x] where x must be 0 or 1, i.e. a valid ordinal for that enum.
Note that in Java enums actually are classes (and enum values thus are objects) and thus you can't cast an int or even Integer to an enum.
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How to match a String against string literals in Rust?
...nk the match fails because of whitespace that trim() removes. This is nice for deferencing to match against user input.
– Gerard Sexton
Sep 20 '16 at 13:25
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Convert XML to JSON (and back) using Javascript
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thanks for the reply! In my case, the JSON is the canonical representation, and XML is just used for XSLT.. the use of which is not my idea! :)
– Jason Suárez
Nov 20 '09 at 23:29
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class
...lt; self opens up self's singleton class, so that methods can be redefined for the current self object (which inside a class or module body is the class or module itself). Usually, this is used to define class/module ("static") methods:
class String
class << self
def value_of obj
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Pass data to layout that are common to all pages
... provide such page title, page name and the location where we actually are for an HTML helper I did which perform some action. Also each page have their own view models properties.
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