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How can I select random files from a directory in bash?
I have a directory with about 2000 files. How can I select a random sample of N files through using either a bash script or a list of piped commands?
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Regular expression matching a multiline block of text
...e.MULTILINE)
I think your biggest problem is that you're expecting the ^ and $ anchors to match linefeeds, but they don't. In multiline mode, ^ matches the position immediately following a newline and $ matches the position immediately preceding a newline.
Be aware, too, that a newline can consi...
Replace multiple characters in a C# string
...\n]{2}/\n/g
s/ at the beginning means a search
The characters between [ and ] are the characters to search for (in any order)
The second / delimits the search-for text and the replace text
In English, this reads:
"Search for ; or , or \t or \r or (space) or exactly two sequential \n and repla...
Return first N key:value pairs from dict
...is answer is no longer correct. Python dicts now preserve insertion order, and this is explicitly documented.
– Konrad Rudolph
Sep 22 at 12:30
1
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Renaming files in a folder to sequential numbers
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Try to use a loop, let, and printf for the padding:
a=1
for i in *.jpg; do
new=$(printf "%04d.jpg" "$a") #04 pad to length of 4
mv -i -- "$i" "$new"
let a=a+1
done
using the -i flag prevents automatically overwriting existing files.
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Applicatives compose, monads don't
What does the above statement mean? And when is one preferable to other?
5 Answers
5
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Repeat String - Javascript
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Note to new readers: This answer is old and and not terribly practical - it's just "clever" because it uses Array stuff to get
String things done. When I wrote "less process" I definitely meant
"less code" because, as others have noted in subsequent answers, it...
How do I handle newlines in JSON?
I've generated some JSON and I'm trying to pull it into an object in JavaScript. I keep getting errors. Here's what I have:
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Limit a stream by a predicate
...tream.iterator(), wrap the Iterator to have a "take-while" implementation, and then go back to a Spliterator and then a Stream. Or -- maybe -- wrap the Spliterator, though it can't really be split anymore in this implementation.
Here's an untested implementation of takeWhile on a Spliterator:
sta...
What is N-Tier architecture?
...er architecture in which,
the presentation, the application
processing and the data management are
logically separate processes. For
example, an application that uses
middleware to service data requests
between a user and a database employs
multi-tier architecture. The most
widesprea...