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Bash tool to get nth line from a file
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832
head and pipe with tail will be slow for a huge file. I would suggest sed like this:
sed 'NUMq;...
How to call a Parent Class's method from Child Class in Python?
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edited Mar 11 at 4:22
Jason
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answered Apr ...
Python Script execute commands in Terminal
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201
There are several ways to do this:
A simple way is using the os module:
import os
os.system(...
How to select rows that have current day's timestamp?
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John WooJohn Woo
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How can I remove the first line of a text file using bash/sed script?
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Try tail:
tail -n +2 "$FILE"
-n x: Just print the last x lines. tail -n 5 would give you the last 5 lines of the input. The + sign kind of inverts the argument and make tail print anything but the first x-1 lines. tail -n +1 would print the w...
How to normalize a NumPy array to within a certain range?
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audio /= np.max(np.abs(audio),axis=0)
image *= (255.0/image.max())
Using /= and *= allows you to eliminate an intermediate temporary array, thus saving some memory. Multiplication is less expensive than division, so
image *= 255.0/image.max() # Uses 1 division and ...
How to create a hex dump of file containing only the hex characters without spaces in bash?
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254
xxd -p file
Or if you want it all on a single line:
xxd -p file | tr -d '\n'
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How do I redirect in expressjs while passing some context?
...at({
pathname:"/",
query: {
"a": 1,
"b": 2,
"valid":"your string here"
}
}));
});
So if you want to redirect all req query string variables you can simply do
res.redirect(url.format({
pathname:"/",
query:req.query,
});
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How do I read the first line of a file using cat?
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edited Sep 27 '19 at 15:34
Akaisteph7
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