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How can I recover a removed file in Mercurial (if at all)?
...grep to find the deleted file you wish to recover. The output of this command will show you the last revision for which the file was present, and the path to the deleted file.
Second, run hg revert -r <revision number> <path to deleted file>
The deleted file will now be in your working ...
.NET data structures: ArrayList, List, HashTable, Dictionary, SortedList, SortedDictionary — Speed,
...of complex data structures. Unfortunately, some of them are quite similar, and I'm not always sure when to use one and when to use another. Most of my C# and Visual Basic books talk about them to a certain extent, but they never really go into any real detail.
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mysql update column with value from another table
... is perfect in this situation. I also used CONCAT_WS to merge pruduct name and SKU from another table
– vladkras
Jul 16 '14 at 5:43
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Print function log /stack trace for entire program using firebug
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Firefox provides console.trace() which is very handy to print the call stack. It is also available in Chrome and IE 11.
Alternatively try something like this:
function print_call_stack() {
var stack = new Error().stack;
console.log("PRINTING CALL STACK");
console....
Accessing bash command line args $@ vs $*
In many SO questions and bash tutorials I see that I can access command line args in bash scripts in two ways:
5 Answers
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Why is the use of tuples in C++ not more common?
...obody seem to use tuples in C++, either the Boost Tuple Library or the standard library for TR1? I have read a lot of C++ code, and very rarely do I see the use of tuples, but I often see lots of places where tuples would solve many problems (usually returning multiple values from functions).
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Is there a print_r or var_dump equivalent in Ruby / Ruby on Rails?
...to dump the structure of an object, similar to the PHP functions print_r and var_dump for debugging reasons.
10 Answers...
PostgreSQL “DESCRIBE TABLE”
... equivalent of Oracle's DESCRIBE TABLE in PostgreSQL (using the psql command)?
22 Answers
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Call a function from another file?
...need to add file.py while importing. Just write from file import function, and then call the function using function(a, b). The reason why this may not work, is because file is one of Python's core modules, so I suggest you change the name of your file.
Note that if you're trying to import function...
linux: kill background task
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There's a special variable for this in bash:
kill $!
$! expands to the PID of the last process executed in the background.
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