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How do you run a command for each line of a file?
...
Read a file line by line and execute commands: 4 answers
This is because there is not only 1 answer...
shell command line expansion
xargs dedicated tool
while read with some remarks
while read -u using dedicated fd, for interactive process...
What are the differences between local branch, local tracking branch, remote branch and remote track
...origin
You can see which locations these remote names are shortcuts for, by running git remote -v:
$ git remote -v
bitbucket git@bitbucket.org:flimm/example.git (fetch)
bitbucket git@bitbucket.org:flimm/example.git (push)
origin git@github.com:Flimm/example.git (fetch)
origin git@github.com:Flimm...
How to concatenate twice with the C preprocessor and expand a macro as in “arg ## _ ## MACRO”?
...tution takes place. A parameter in the replacement list, unless preceded
by a # or ## preprocessing token or followed by a ## preprocessing token (see below), is
replaced by the corresponding argument after all macros contained therein have been
expanded. Before being substituted, each argumen...
Redis is single-threaded, then how does it do concurrent I/O?
...pporting concurrent I/Os means the server is able to serve several clients by executing several flows corresponding to those clients with only one computation unit. In this context, parallelism would mean the server is able to perform several things at the same time (with multiple computation units)...
Simple way to calculate median with MySQL
...um:=0) r
WHERE d.val is NOT NULL
-- put some where clause here
ORDER BY d.val
) as dd
WHERE dd.row_number IN ( FLOOR((@total_rows+1)/2), FLOOR((@total_rows+2)/2) );
Steve Cohen points out, that after the first pass, @rownum will contain the total number of rows. This can be used to determin...
FormData.append(“key”, “value”) is not working
... thanks - this was a useful quick way to get the FormData object by typing it into the Chrome console.
– Dan Smart
Apr 20 '13 at 13:08
...
How to test that no exception is thrown?
... of functionality.
Or, as defined in The art of Unit Testing, 2nd Edition by Roy Osherove, page 11:
A unit test is an automated piece of code that invokes the unit of work being tested, and then checks some assumptions about a single end result of that unit. A unit test is almost always written...
Explain the use of a bit vector for determining if all characters are unique
...re are two differences between them:
Size. int has fixed size, usually 4 bytes which means 8*4=32 bits (flags). Bit vector usually can be of different size or you should specify the size in constructor.
API. With bit vectors you will have easier to read code, probably something like this:
vector....
Is there a list of Pytz Timezones?
...ocked when I first found it out. (Interestingly enough, the pytz installed by yum on CentOS 7 does not exhibit this problem.)
import pytz
import dateutil.tz
from datetime import datetime
print((datetime(2017,2,13,14,29,29, tzinfo=pytz.timezone('Asia/Shanghai'))
- datetime(2017,2,13,14,29,29, t...
What's with 181783497276652981 and 8682522807148012 in Random (Java 7)?
...tinct from any other invocation of this
constructor.
could be extended by "across threads" and "uncorrelated"
Seed Sequence Quality
But the randomness of the seeding sequence is only as good as the underlying RNG.
The RNG used for the seed sequence in this java implementation uses a multiplic...