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Extract public/private key from PKCS12 file for later use in SSH-PK-Authentication
I want to extract the public and private key from my PKCS#12 file for later use in SSH-Public-Key-Authentication.
7 Answ...
What do I use for a max-heap implementation in Python?
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If you then want to pop elements, use:
heapq.heappop(minheap) # pop from minheap
heapq._heappop_max(maxheap) # pop from maxheap
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What is the effect of extern “C” in C++?
...ared has internal linkage, and so does not have a language linkage
Linkage from C++ to objects defined in other languages and to objects defined in C++ from other languages is implementation-defined and language-dependent. Only where the object layout strategies of two language implementations are s...
Convert RGBA PNG to RGB with PIL
... I found while building RGBA -> JPG + BG support for sorl thumbnails.
from PIL import Image
png = Image.open(object.logo.path)
png.load() # required for png.split()
background = Image.new("RGB", png.size, (255, 255, 255))
background.paste(png, mask=png.split()[3]) # 3 is the alpha channel
ba...
How do you add swap to an EC2 instance?
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That dd command line means "copy from /dev/zero to /var/swap.1. Do that by reading 1024 blocks of size 1 megabyte". It's a quick way to create a 1GB file full of zeroes.
– Nelson
Jan 21 '15 at 4:43
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What is the apply function in Scala?
I never understood it from the contrived unmarshalling and verbing nouns ( an AddTwo class has an apply that adds two!) examples.
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Column order manipulation using col-lg-push and col-lg-pull in Twitter Bootstrap 3
...-vp-push-x = push the column to the right by x number of columns, starting from where the column would normally render -> position: relative, on a vp or larger view-port.
col-vp-pull-x = pull the column to the left by x number of columns, starting from where the column would normally render ->...
Wait for a process to finish
...acOS, for example, implements BSD's kqueue), but not all make it available from command-line.
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Converting between java.time.LocalDateTime and java.util.Date
...ateTime.ofInstant(in.toInstant(), ZoneId.systemDefault());
Date out = Date.from(ldt.atZone(ZoneId.systemDefault()).toInstant());
Explanation:
(based on this question about LocalDate)
Despite its name, java.util.Date represents an instant on the time-line, not a "date". The actual data stored with...
Divide a number by 3 without using *, /, +, -, % operators
.../ 3 = a/4 + a/16 + a/64 + (..). Dividing by 4 is where the bit shift comes from. The last check on num==3 is needed because we've only got integers to work with.
– Yorick Sijsling
Jul 30 '12 at 12:40
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