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Linux bash: Multiple variable assignment
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First thing that comes into my mind:
read -r a b c <<<$(echo 1 2 3) ; echo "$a|$b|$c"
output is, unsurprisingly
1|2|3
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Where to define custom error types in Ruby and/or Rails?
...w to handle this with ActiveRecord models.
Creating Custom Error
class MyClass
# create a custome error
class MissingRequirement < StandardError; end
def my_instance_method
raise MyClass::MissingRequirement, "My error msg" unless true
end
end
Testing (minitest)
test "should...
See what process is using a file in Mac OS X
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lsof | grep myfilename worked for me. I've got a PDF file in my Trash that the system claims is in use. Weirdly lsof claims it's in use by Preview but Preview doesn't seem to be running (eg when I command-tab through the running apps) b...
How to calculate percentage with a SQL statement
...ing parenthesis.
Select Grade, (Count(Grade)* 100 / (Select Count(*) From MyTable)) as Score
From MyTable
Group By Grade
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How to overwrite the previous print to stdout in python?
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@PhilMacKay: I tried that in python on my Mac: In [3]: print "Thing to erase\r", ; time.sleep(1) ; print "--------------\r", -------------- I think your problem is Windows and its different line ends. Try this: import curses; curses.setupterm(fd=sys.stdout.fileno(...
How can I fix the Microsoft Visual Studio error: “package did not load correctly”?
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I'm having this problem on my fresh install of Visual Studio 2017... and again, the folder structure is not the same!
– Really Nice Code
Mar 18 '17 at 6:15
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How to un-escape a backslash-escaped string?
...istopheD's answer covers python 2.
# create a `bytes` object from a `str`
my_str = "Hello,\\nworld"
# (pick an encoding suitable for your str, e.g. 'latin1')
my_bytes = my_str.encode("utf-8")
# or directly
my_bytes = b"Hello,\\nworld"
print(my_bytes.decode("unicode_escape"))
# "Hello,
# world"
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Where in memory are my variables stored in C?
By considering that the memory is divided into four segments: data, heap, stack, and code, where do global variables, static variables, constant data types, local variables (defined and declared in functions), variables (in main function), pointers, and dynamically allocated space (using malloc and ...
How can I avoid running ActiveRecord callbacks?
...r solution for any version of Rails. It works for us well. Check it out in my blog post: railsguides.net/2014/03/25/skip-callbacks-in-tests
– ka8725
Apr 11 '14 at 9:01
add a c...
Adding custom radio buttons in android
...ng the functionality intact .... All i am trying to achieve as i showed in my question ... Any further directions ! [Note:: please look at the updated question]
– Devrath
Oct 3 '13 at 16:41
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