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What are the special dollar sign shell variables?
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1398
$1, $2, $3, ... are the positional parameters.
"$@" is an array-like construct of all positi...
How to add a new audio (not mixing) into a video using ffmpeg?
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Replace audio
ffmpeg -i video.mp4 -i audio.wav -map 0:v -map 1:a -c:v copy -shortest output.mp4
The -map option allows you to manually select streams / tracks. See FFmpeg Wiki: Map for more info.
This example uses -c:v copy to stream copy (mux) the video. No re-encoding of the video ...
Understanding how recursive functions work
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Mod of negative number is melting my brain
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add a string prefix to each value in a string column using Pandas
...gt;>> df = pd.DataFrame({'col':['a',0]})
>>> df
col
0 a
1 0
>>> df['col'] = 'str' + df['col'].astype(str)
>>> df
col
0 stra
1 str0
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Code Golf - π day
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15
votes
In dc: 88 and 93 93 94 96 102 105 129 138 141 chars
Just in case, I am usin...
How to convert a string or integer to binary in Ruby?
...a string representing the number in the base specified:
9.to_s(2) #=> "1001"
while the reverse is obtained with String#to_i(base):
"1001".to_i(2) #=> 9
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Quickest way to convert a base 10 number to any base in .NET?
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How to check if BigDecimal variable == 0 in java?
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10 Answers
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Replacing column values in a pandas DataFrame
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