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Bash command to sum a column of numbers [duplicate]
...wk since 2 tools are needed to do the job.
$ wc -l file
49999998 file
$ time paste -sd+ file | bc
1448700364
real 1m36.960s
user 1m24.515s
sys 0m1.772s
$ time awk '{s+=$1}END{print s}' file
1448700364
real 0m45.476s
user 0m40.756s
sys 0m0.287s
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How do I get time of a Python program's execution?
...e program in Python that takes a while to finish. I want to know the exact time it takes to finish running.
31 Answers
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Fast Linux File Count for a large number of files
...nd find call stat() when certain options are used, such as ls -l or find -mtime.
– mark4o
Jul 19 '10 at 23:46
7
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Display current date and time without punctuation
For example, I want to display current date and time as the following format:
5 Answers
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Convert datetime to Unix timestamp and convert it back in python
I have dt = datetime(2013,9,1,11) , and I would like to get a Unix timestamp of this datetime object.
11 Answers
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In Python, how do you convert a `datetime` object to seconds?
...difference between the two dates in seconds. Subtracting two dates gives a timedelta object, which as of Python 2.7 has a total_seconds() function.
>>> (t-datetime.datetime(1970,1,1)).total_seconds()
1256083200.0
The starting date is usually specified in UTC, so for proper results the da...
Bash script to calculate time elapsed
I am writing a script in bash to calculate the time elapsed for the execution of my commands, consider:
10 Answers
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Find element's index in pandas Series
...your series has a sequential integer index. If your series index is by datetime, this doesn't work.
– Andrew Medlin
Jul 7 '18 at 11:45
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How to read a large file - line by line?
... f:
for line in f:
do something with data
2. use of yield
Sometimes one might want more fine-grained control over how much to read in each iteration. In that case use iter & yield. Note with this method one explicitly needs close the file at the end.
def readInChunks(fileObj, chunkS...
Why is printing to stdout so slow? Can it be sped up?
...ided to look into it and was quite surprised to find that almost all the time spent is waiting for the terminal to process the results.
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