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How do you create different variable names while in a loop? [duplicate]
...ou can do this is with exec(). For example:
for k in range(5):
exec(f'cat_{k} = k*2')
>>> print(cat_0)
0
>>> print(cat_1)
2
>>> print(cat_2)
4
>>> print(cat_3)
6
>>> print(cat_4)
8
Here I am taking advantage of the handy f string formatting in Py...
How can I parse a YAML file from a Linux shell script?
...n't work for all YAML, you're right. That's why I opened with a few qualifications. I just shared what worked for my use case, since it answered the question better than any other at the time. This can definitely be expanded.
– Curtis Blackwell
Nov 27 '13 at 13...
How to extract one column of a csv file
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yes. cat mycsv.csv | cut -d ',' -f3 will print 3rd column.
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Why are these numbers not equal?
...presented exactly in binary?
Is floating point math broken?
Canonical duplicate for "floating point is inaccurate" (a meta discussion about a canonical answer for this issue)
Comparing scalars
The standard solution to this in R is not to use ==, but rather the all.equal function. Or rather, sinc...
Count all occurrences of a string in lots of files with grep
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cat * | grep -c string
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MySQL Results as comma separated list
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You can use GROUP_CONCAT to perform that, e.g. something like
SELECT p.id, p.name, GROUP_CONCAT(s.name) AS site_list
FROM sites s
INNER JOIN publications p ON(s.id = p.site_id)
GROUP BY p.id, p.name;
...
Interface vs Base class
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Let's take your example of a Dog and a Cat class, and let's illustrate using C#:
Both a dog and a cat are animals, specifically, quadruped mammals (animals are waaay too general). Let us assume that you have an abstract class Mammal, for both of them:
public abs...
Relative paths based on file location instead of current working directory [duplicate]
..._path=$( cd "$(dirname "${BASH_SOURCE[0]}")" ; pwd -P )
cd "$parent_path"
cat ../some.text
This will make your shell script work independent of where you invoke it from. Each time you run it, it will be as if you were running ./cat.sh inside dir.
Note that this script only works if you're invoki...
Is there a method for String conversion to Title Case?
... Just a small update, WordUtils is gone to Commons Text and is deprecated inside Commons Lang
– msrd0
Oct 16 '17 at 21:45
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Shell one liner to prepend to a file
... Works for me on 600K files with awk. However trying the same trick using 'cat' fails.
Passing the prependage as a variable to awk (-v TEXT="$text") overcomes the literal quotes problem which prevents doing this trick with 'sed'.
#!/bin/bash
text="Hello world
What's up?"
exec 3<> yourfile &...