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How to use sed to replace only the first occurrence in a file?
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or, if you prefer: Editor's note: works with GNU sed only.
sed '0,/foo/s//bar/' file
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Counting the number of True Booleans in a Python List
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After array_filter(), how can I reset the keys to go in numerical order starting at 0
...y certain transformations on it depending on the placeholder starting from 0, but unfortunately it still retains the original index. I looked for a while and couldn't see anything, perhaps I just missed the obvious, but my question is...
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efficient circular buffer?
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206
I would use collections.deque with a maxlen arg
>>> import collections
>>> d...
Using jQuery to see if a div has a child with a certain class
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201
You can use the find function:
if($('#popup').find('p.filled-text').length !== 0)
// Do Stu...
Code for a simple JavaScript countdown timer?
I want to use a simple countdown timer starting at 30 seconds from when the function is run and ending at 0. No milliseconds. How can it be coded?
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Cross-browser custom styling for file upload button [duplicate]
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label.myLabel input[type="file"] {
position:absolute;
top: -1000px;
}
/***** Example custom styling *****/
.myLabel {
border: 2px solid #AAA;
border-radius: 4px;
padding: 2px 5px;
margin: 2px;
background: #DDD;
display: inline-block;
}
.myLabel:hove...
Detail change after Git pull
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209
Suppose you're pulling to master. You can refer to the previous position of master by master@{1...
Microsecond timing in JavaScript
... It returns the number of microseconds in the fractional (e.g. a value of 1000.123 is 1 second and 123 microseconds).
now() is monotonically increasing. This is important as Date.getTime() can possibly jump forward or even backward on subsequent calls. Notably, if the OS's system time is updated (...
Fetch frame count with ffmpeg
...below.
ffprobe: Query the container
ffprobe -v error -select_streams v:0 -show_entries stream=nb_frames -of default=nokey=1:noprint_wrappers=1 input.mp4
This is a fast method.
Not all formats (such as Matroska) will report the number of frames resulting in the output of N/A. See the other met...