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Getting the count of unique values in a column in bash
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The GNU site suggests this nice awk script, which prints both the words and their frequency.
Possible changes:
You can pipe through sort -nr (and reverse word and freq[word]) to see the result in descending order.
If you want a specific column, you can omit the for loop and simply write...
Difference between JOIN and INNER JOIN
...es of complex syntax. It is more appropriate to say that INNER is a "noise word".
– philipxy
Jul 8 '19 at 20:46
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Is there a standard naming convention for XML elements? [closed]
...iods
- Element names cannot contain spaces
Any name can be used, no words are reserved (except xml).
Best Naming Practices
- Create descriptive names, like this: <person>, <firstname>, <lastname>.
- Create short and simple names, like this: <book_title> not l...
What Haskell representation is recommended for 2D, unboxed pixel arrays with millions of pixels?
...indexing.
In Repa, your triple of shorts would have the type:
Array DIM3 Word16
That is, a 3D array of Word16s.
For bitonal images I will need to store only 1 bit per pixel.
UArrays pack Bools as bits, Vector uses the instance for Bool which does do bit packing, instead using a representation ...
Matching a space in regex
...engines, "\s" and its variations are the way to go. In addition, I believe word boundaries match start and end of lines as well, important when you're looking for words that may appear without preceding or following spaces.
For PHP specifically, this page may help.
From your edit, it appears you w...
What is a vertical tab?
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Microsoft Word uses VT as a line separator in order to distinguish it from the normal new line function, which is used as a paragraph separator.
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Escaping regex string
...nally followed by 's', and return the match object.
def simplistic_plural(word, text):
word_or_plural = re.escape(word) + 's?'
return re.match(word_or_plural, text)
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What are the differences between Rust's `String` and `str`?
...r is quite close to a String (but not to a &String). A &str is two words; one pointer to a the first byte of a str and another number that describes how many bytes long the the str is.
Contrary to what is said, a str does not need to be immutable. If you can get a &mut str as an exclusi...
Simple Vim commands you wish you'd known earlier [closed]
..." You don't have to type it again
The "trick" here (for want of a better word) is the way that you can use the search to create the regexp (and 'incsearch' highlights it as you enter characters) and then use an empty pattern in the substitution: the empty pattern defaults to the last search patter...
How to copy yanked text to VI command prompt
...n paste yanked text to the command window. For instance if I have yanked a word and I want to grep it in some location I can't simply paste the word using 'p'. However if I copy it to clipboard, Shift-Insert will paste the same thing.
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