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How to delete duplicate lines in a file without sorting it in Unix?
... To save it in a file we can do this awk '!seen[$0]++' merge_all.txt > output.txt
– Akash Kandpal
Jul 19 '18 at 11:42
5
...
How do I programmatically determine if there are uncommitted changes?
...ing git diff once solves the issue (surprisingly enough, git diff does actually change the content of the sandbox, meaning here .git/index)
These timestamp issues can also occur if git is running in docker.
Original answer:
"Programmatically" means never ever rely on porcelain commands.
Always rel...
Difference between std::result_of and decltype
...a SFINAE-friendly expression, whereas std::result_of could give you a hard error instead of a deduction failure. That has been corrected in C++14: std::result_of is now required to be SFINAE-friendly (thanks to this paper).
So on a conforming C++14 compiler, std::result_of_t<F(Args...)> is st...
How to import a module given its name as string?
...each import individually wrapped in a try: mods=__import__()\nexcept ImportError as error: report(error) to allow other commands to continue to work while the bad ones get fixed.
– DevPlayer
Apr 8 '15 at 13:38
...
Check if SQL Connection is Open or Closed
...
@user613326 actually, it wouldn't. There is no error handling in the example code, so any problems while connecting will simply throw and leave you to handle the exception. The returned value is therefore correct.
– Tom Lint
Aug 6 at...
Why are dates calculated from January 1st, 1970?
...for bugs. Such a count is impossible for a human to instantly decipher, so errors or issues won't be easily flagged when debugging and logging. Another problem is the ambiguity of granularity explained below.
I strongly suggest instead serializing date-time values as unambiguous ISO 8601 strings for...
How does “cat
...f the variable PS2, processed as described in Shell Variables, to standard error before reading each line of input until the delimiter has been recognized.
Examples
Some examples not yet given.
Quotes prevent parameter expansion
Without quotes:
a=0
cat <<EOF
$a
EOF
Output:
0
With qu...
Convert from List into IEnumerable format
...t;> to an IEnumerable<IEnumerable<obj>> it gives a compiler error since the second does not inherit from the first one.
– Emaborsa
Jul 24 '17 at 11:08
...
How can I see what I am about to push with git?
...hing a large amount of data, it uploads all of the data and then shows any errors after. You've just wasted time and bandwidth uploading data that you now have to re-upload. This seems like strange behavior.
– zeusstl
Jan 19 '15 at 7:04
...
Any gotchas using unicode_literals in Python 2.6?
..."one.py", line 5, in <module>
print name + two.name
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 4: ordinal not in range(128)
In this example, two.name is an utf-8 encoded string (not unicode) since it did not import unicode_literals, and one.name is an unicode st...