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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...
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...
How to extract one column of a csv file
...
yes. cat mycsv.csv | cut -d ',' -f3 will print 3rd column.
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MySQL Results as comma separated list
...
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
...
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...
Count all occurrences of a string in lots of files with grep
...
cat * | grep -c string
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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
...
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 &...