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How does grep run so fast?
...
Assuming your question regards GNU grep specifically. Here's a note from the author, Mike Haertel:
GNU grep is fast because it AVOIDS LOOKING AT EVERY INPUT BYTE.
GNU grep is fast because it EXECUTES VERY FEW INSTRUCTIONS FOR EACH
BYTE that it
does look at.
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Why does Go have a “goto” statement
... In your example, why not just introduce a function small(x,z) to call instead? That way we don't have to think about what variables are accessible in the small: label. I suspect the reason is go still lacks certain types of inlining support in the compiler.
– Thomas A...
Multiline bash commands in makefile
... append multiline with \ BTW bash guys usually recommend to replace `find` call with $$(find)
– Yauhen Yakimovich
Aug 17 '13 at 0:46
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What is the EAFP principle in Python?
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I call it "optimistic programming". The idea is that most times people will do the right thing, and errors should be few. So code first for the "right thing" to happen, and then catch the errors if they don't.
My feeling i...
Python strptime() and timezones?
...er.parse("Thu, 25 Sep 2003 10:49:41,123 -0300") Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/Users/wanghq/awscli/lib/python2.7/site-packages/dateutil/parser.py", line 748, in parse return DEFAULTPARSER.parse(timestr, **kwargs) ...
Input and output numpy arrays to h5py
...of the order of 500 MB. I read that using h5py reduces the file size considerably. So, let's say I have the 2D numpy array named A . How do I save it to an h5py file?
Also, how do I read the same file and put it as a numpy array in a different code, as I need to do manipulations with the array?
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How to test an SQL Update statement before running it?
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In addition to using a transaction as Imad has said (which should be mandatory anyway) you can also do a sanity check which rows are affected by running a select using the same WHERE clause as the UPDATE.
So if you UPDATE is
UPDATE foo
SET bar = 42
WHERE col1 = 1
AN...
Loop through files in a directory using PowerShell
...d to entirely be native to Powershell. And even if they did, you still can call Win32 Utils directly from Powershell. AFAIK using whatever is available and compatible is not actually a bad thing.
– user1628658
Nov 9 '17 at 22:45
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How to make clang compile to llvm IR
... linker, create a symlink to that linker named "ld" in a special directory called "fakebin" somewhere on your computer, and add the option
-B/home/jeremy/fakebin
to any linking steps above.
share
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Symfony 2: How do I check if a user is not logged in inside a template?
...er
{% endif %}
from the docs:
IS_AUTHENTICATED_ANONYMOUSLY - automatically assigned to a user who is
in a firewall protected part of the site but who has not actually
logged in. This is only possible if anonymous access has been allowed.
IS_AUTHENTICATED_REMEMBERED - automatically ass...