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DESTDIR and PREFIX of make
...alling to a temporary directory which is not where the package will be run from. For example this is used when building deb packages. The person building the package doesn't actually install everything into its final place on his own system. He may have a different version installed already and not ...
How to compare two dates?
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Use the datetime method and the operator < and its kin.
>>> from datetime import datetime, timedelta
>>> past = datetime.now() - timedelta(days=1)
>>> present = datetime.now()
>>> past < present
True
>>> datetime(3000, 1, 1) < present
False
&g...
wildcard ssl on sub-subdomain [closed]
...for *.example.net will match sub.example.net but not sub.sub.example.net.
From RFC 2818:
Matching is performed using the matching rules specified by
RFC2459. If more than one identity of a given type is present in
the certificate (e.g., more than one dNSName name, a match in any one
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Recursive Lock (Mutex) vs Non-Recursive Lock (Mutex)
...maphore - no recursion or inheritance, acts as a coherent resource counter from any desired initial count, threads only block where net count against the resource is zero.
Again, this varies somewhat by platform - especially what they call these things, but this should be representative of the con...
How to import existing Git repository into another?
... copying the files with cp and committing the result.
Original source was from github's "Subtree Merge" help article. And another useful link.
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How does IPython's magic %paste work?
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I think it depends on the environment from which you are doing the pasting and how you are doing the pasting? My colleague is using Windows 10's command prompt to SSH into our Linux host, opens ipython in a Docker container there and tries to paste already-indent...
Rollback a Git merge
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From here:
http://www.christianengvall.se/undo-pushed-merge-git/
git revert -m 1 <merge commit hash>
Git revert adds a new commit that rolls back the specified commit.
Using -m 1 tells it that this is a merge and w...
Easy way to test a URL for 404 in PHP?
...ser has contributed the following:
/**
This is a modified version of code from "stuart at sixletterwords dot com", at 14-Sep-2005 04:52. This version tries to emulate get_headers() function at PHP4. I think it works fairly well, and is simple. It is not the best emulation available, but it works.
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Effect of a Bitwise Operator on a Boolean in Java
...nswers, it's worth noting that && and || have different precedence from & and |.
Extract from the precedence table (with highest precedence at the top).
bitwise AND &
bitwise exclusive OR ^
bitwise inclusive OR |
logical AND &&
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What is the relationship between the docker host OS and the container base image OS?
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The container's kernel is going to be the one from ubuntu, but nothing more. You can run easily centos, archlinux, debian or any other linux based distribution as containers.
– creack
Sep 18 '13 at 17:15
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