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How to verify if a file exists in a batch file?
...n - they don't cost much. Adding a further question comment to one that is more than 3 years old isn't likely to garner many responses (but check SO first for answers to this precise question, else you'll get your new question marked as a duplicate...)
– Magoo
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What is the best way to concatenate two vectors?
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How to get first record in each group using Linq
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Ruby convert Object to Hash
... I will never understand the ruby fetish for each. map and inject are much more powerful. This is one design qualm I have with Ruby: map and inject are implemented with each. It's simply bad computer science.
– Nate Symer
Apr 21 '15 at 17:01
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How to delete last item in list?
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How can i use iptables on centos 7? [closed]
... CentOS 7, firewalld was introduced to manage iptables. IMHO, firewalld is more suited for workstations than for server environments.
It is possible to go back to a more classic iptables setup. First, stop and mask the firewalld service:
systemctl stop firewalld
systemctl mask firewalld
Then, in...
how can you easily check if access is denied for a file in .NET?
...een when you check the file and when you try to open it. A change is even more likely if you're in an area where you know you need to check first. Yet strangely enough it will never happen in your testing or development environments, which tend to be fairly static. This makes the problem difficul...
simulate background-size:cover on or
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How is malloc() implemented internally? [duplicate]
...shared memory, mmap is how you do it).
So you have two methods of getting more memory from the kernel: sbrk and mmap. There are various strategies on how to organize the memory that you've got from the kernel.
One naive way is to partition it into zones, often called "buckets", which are dedicated...
What is the difference between ArrayList.clear() and ArrayList.removeAll()?
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e.remove() is way more complex! e.remove() also squares the complexity, just as c.contains(...) does. On an ArrayList, e.remove() calls ArrayList.remove(int index), which has to shift the remainder of the array over by one.
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