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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....
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...
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...
p vs puts in Ruby
...nd
# This increments nicely to give the dev some indication of progress / time until completion
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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.
...
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...
Generating an MD5 checksum of a file
...
You can use hashlib.md5()
Note that sometimes you won't be able to fit the whole file in memory. In that case, you'll have to read chunks of 4096 bytes sequentially and feed them to the md5 method:
import hashlib
def md5(fname):
hash_md5 = hashlib.md5()
wi...
Javascript objects: get parent [duplicate]
...lementing this seem to be...
Use an init function to loop through at the time the nested object is created, or...
Supply the nested object to a function that fills out the parent property
Both approaches have the same issue...
How do you maintain parents as the nested object grows/changes??
If...
Iterating a JavaScript object's properties using jQuery
...calld for every element in the array / every property in the object. Every time the function is called, it get the index and value / name and value passed in as arguments. In my example the parameter "n" are the two string "John" and "JS". The "name" property would be "undefined".
...
What does “|=” mean? (pipe equal operator)
...lar, when applied to a boolean variable "|=" will set it to TRUE the first time it encounters a truthy expression on the right side and will HOLD its TRUE value for all |= subsequent calls. Like a latch.
Here a simplified example of this:
groovy> boolean result
groovy> //------------
groo...