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Is double square brackets [[ ]] preferable over single square brackets [ ] in Bash?
... && b = b ]]: true, logical and
[ a = a && b = b ]: syntax error, && parsed as an AND command separator cmd1 && cmd2
[ a = a -a b = b ]: equivalent, but deprecated by POSIX³
[ a = a ] && [ b = b ]: POSIX and reliable equivalent
(
[[ (a = a || a = b) &...
Maximum single-sell profit
...oblem in each subarray, then combining the two together. Turns out we actually can do this, and can do so efficiently! The intuition is as follows. If we have a single day, the best option is to buy on that day and then sell it back on the same day for no profit. Otherwise, split the array into ...
How to delete selected text in the vi editor
...
Actually, vim has great mouse support if your terminal supports it. For example using the gpm daemon in a console, or running xterm or konsole in a graphical environment, you can tell vim set mouse=a (or add it to your .vimrc) a...
How do I adb pull ALL files of a folder present in SD Card
...to restart adb as root: type adb root before pull. Otherwise you'll get an error saying remote object '/data/data/xxx.example.app' does not exist
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The preferred way of creating a new element with jQuery
...property of the element to a string, which happens to be HTML, and is more error prone and less flexible.
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Why doesn't Haskell's Prelude.read return a Maybe?
...ersions floating around many codebases).
See also this discussion.
Personally, I use the version from the safe package.
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Should I use Java's String.format() if performance is important?
...arking, so I did.
Results:
Benchmark Mode Cnt Score Error Units
MyBenchmark.testOld thrpt 20 9645.834 ± 238.165 ops/s // using +
MyBenchmark.testNew thrpt 20 429.898 ± 10.551 ops/s // using String.format
Units are operations per second, the more the better. ...
How can I use grep to find a word inside a folder?
..., a directory is a kind of file (there is a term "regular file" to specifically refer to entities that are called just "files" in Windows).
grep -nr string reads the content to search from the standard input, that is why it just waits there for input from you, and stops doing so when you press ^C (...
How do I raise the same Exception with a custom message in Python?
...the effect)
For python 2.x where x>=6:
try:
try:
raise ValueError # something bad...
except ValueError as err:
err.message=err.message+" hello"
raise # re-raise current exception
except ValueError as e:
print(" got error of type "+ str(type(e))+" with...
redirect COPY of stdout to log file from within bash script itself
...only stdout would be captured - i.e. your
# log file would not contain any error messages.
# SEE (and upvote) the answer by Adam Spiers, which keeps STDERR
# as a separate stream - I did not want to steal from him by simply
# adding his answer to mine.
exec 2>&1
echo "foo"
echo "bar" >&am...