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How to remove illegal characters from path and filenames?
...he forseeable future, so all you're really doing is doubling the amount of time this function takes to run because you're worried that the definition of a valid path will change sometime soon. Which it won't.
– Warren Rumak
Jan 27 '14 at 19:09
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How to calculate time difference in java?
I want to subtract two timeperiods say 16:00:00 from 19:00:00. Is there any java function for this? The results can be in milliseconds, seconds, or minutes.
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p vs puts in Ruby
...nd
# This increments nicely to give the dev some indication of progress / time until completion
>> ******
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Creating a zero-filled pandas data frame
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Testing this I find %timeit temp = np.zeros((10, 11)); d = pd.DataFrame(temp, columns = ['col1', 'col2',...'col11']) takes 156 us. But %timeit d = pd.DataFrame(0, index = np.arange(10), columns = ['col1', 'col2',...'col11']) takes 171 us. I'm sur...
Quickly create a large file on a Linux system
...the file contents)... And that initialization is what takes up so much I/O time. (Want to make it take even longer? Use /dev/random instead of /dev/zero! Then you'll use CPU as well as I/O time!) In the end though, dd is a poor choice (though essentially the default used by the VM "create" GUIs). E....
Why would iterating over a List be faster than indexing through it?
...item2 -> item3 print item3
This is horribly inefficient because every time you are indexing it restarts from the beginning of the list and goes through every item. This means that your complexity is effectively O(N^2) just to traverse the list!
If instead I did this:
for(String s: list) {
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In the shell, what does “ 2>&1 ” mean?
...; cat $testfile
Mon Jan 7 13:18:21 CET 2013
The file is overwritten each time, well now:
$ set -o noclobber
$ date > $testfile ; cat $testfile
bash: /tmp/testNoClobberDate-WW1xi9: cannot overwrite existing file
Mon Jan 7 13:18:21 CET 2013
$ date > $testfile ; cat $testfile
bash: /tmp/test...
What does the C++ standard state the size of int, long type to be?
...ng long and pointer are 64-bit (but long and int are both 32-bit).
At one time, some Unix systems used an ILP64 organization.
None of these de facto standards is legislated by the C standard (ISO/IEC 9899:1999), but all are permitted by it.
And, by definition, sizeof(char) is 1, notwithstanding t...
Hg: How to do a rebase like git's rebase
...ntegrate it at first that didn't work out and I thought was useless at the time". Scientists keep logbooks in pen with numbered pages, and AFAIC software engineers should save every byte they've ever typed. Rewriting history, even cset parentage, but certainly CollapseExtension, HistEdit, etc. viol...
How can I kill a process by name instead of PID?
Sometimes when I try to start Firefox it says "a Firefox process is already running". So I have to do this:
18 Answers
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