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Find lines from a file which are not present in another file [duplicate]
...le1) <(sort -u file2)
Solution 2: (the first "working" answer I found) from unix.stackexchange:
fgrep -v -f file1 file2
Note that if file2 contains duplicate lines that don't exist at all in file1, fgrep will output each of the duplicate lines. Also note that my totally non-scientific tests on...
Is there any reason to use a synchronous XMLHttpRequest?
...
Edited: I realize you're just dumping txt from a lazy HN user, but a little time in phrasing it nicely is appreciated here on SO.
– Frank Krueger
Aug 4 '11 at 16:41
...
How do I convert seconds to hours, minutes and seconds?
...ossible to use time.strftime, which gives more control over formatting:
from time import strftime
from time import gmtime
strftime("%H:%M:%S", gmtime(666))
'00:11:06'
strftime("%H:%M:%S", gmtime(60*60*24))
'00:00:00'
gmtime is used to convert seconds to special tuple format that strftime() re...
How do I undo 'git add' before commit?
...do git add before commit with
git reset <file>
which will remove it from the current index (the "about to be committed" list) without changing anything else.
You can use
git reset
without any file name to unstage all due changes. This can come in handy when there are too many files to be lis...
Converting stream of int's to char's in java
...se InputStreamReader with the appropriate Charset instead.
Simply casting from int to char only works if you want ISO-8859-1, if you're reading bytes from a stream directly.
EDIT: If you are already using a Reader, then casting the return value of read() to char is the right way to go (after check...
Django removing object from ManyToMany relationship
How would I delete an object from a Many-to-Many relationship without removing the actual object?
3 Answers
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Can Selenium Webdriver open browser windows silently in background?
...t install Xvfb:
sudo apt-get install xvfb
then install PyVirtualDisplay from Pypi:
pip install pyvirtualdisplay
Sample Selenium script in Python in a headless mode with PyVirtualDisplay:
#!/usr/bin/env python
from pyvirtualdisplay import Display
from selenium import webdriver
...
Zero-based month numbering [closed]
...
The use of zero to start counting is actually an optimization trick from Assembly programmers. Instead of assigning 1 to the count register, they XOR'ed the register with itself, which was slightly faster in CPU cycles. This meant that counting would start with 0 and would always be up to the...
Why do we use volatile keyword? [duplicate]
...f some_int, so it may be tempted to optimize the while loop by changing it from while(some_int == 100) to something which is equivalent to while(true) so that the execution could be fast (since the condition in while loop appears to be true always). (if the compiler doesn't optimize it, then it has ...
Initial bytes incorrect after Java AES/CBC decryption
... does). Now, one particular use case may be to have encrypted bytes coming from a String, or be sent as a String (base64 MIME attachment for a Mail...), but that is an issue of encoding bytes, for which there exists hundreds of solutions, totally unrelated to AES/encryption.
– ...