大约有 48,000 项符合查询结果（耗时：0.0346秒） [XML]
An example of how to use getopts in bash
... break;;
esac
shift
done
Running this script file:
# With short options grouped together and long option
# With double dash '--version'
bash commandLine.sh --version=1.0 -rV
# With short options grouped together and long option
# With single dash '-version'
bash commandLine.sh -version=1.0 -rV
...
The way to check a HDFS directory's size?
...
When trying to calculate the total of a particular group of files within a directory the -s option does not work (in Hadoop 2.7.1). For example:
Directory structure:
some_dir
├abc.txt
├count1.txt
├count2.txt
└def.txt
Assume each file is 1 KB in size. You...
How do I autoindent in Netbeans?
...n click Ctrl + I at any line, and it'll automatically indent the line or group of lines according to the indentation scheme you chose in the settings.
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How to clear all the jobs from Sidekiq?
...exclusively for Sidekiq, so data contamination/loss isn't an issue for our group. Thanks for posting this.
– meoww-
Sep 1 '19 at 16:41
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MySQL selecting yesterday's date
... UNIX_TIMESTAMP(current_date)) as timesVisitedYesterday
FROM mytable
GROUP BY 1
For the curious, the reason that sum(condition) gives you the count of rows that satisfy the condition, which would otherwise require a cumbersome and wordy case statement, is that in mysql boolean values are 1 f...
What is the dual table in Oracle?
...e two rows in the result
for every one row in your table. Then, by using GROUP BY, the
resulting join could be summarized to show the amount of storage for
the DATA extent and for the INDEX extent(s). The name, DUAL, seemed
apt for the process of creating a pair of rows from just one. 1
It...
Check whether a cell contains a substring
... home builders or community names and I need to bucket the builders as one group. To do this I am looking for the word "builder" or "construction", etc. So -
=IF(OR(COUNTIF(A1,"*builder*"),COUNTIF(A1,"*builder*")),"Builder","Community")
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Using Kafka as a (CQRS) Eventstore. Good idea?
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There is also valuable information here : groups.google.com/forum/#!topic/dddcqrs/rm02iCfffUY
– manuc66
May 25 '16 at 21:07
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Count number of occurences for each unique value
...nique values in each combination of factors:
library("dplyr")
data %>% group_by(factor1, factor2) %>% summarize(count=n())
It uses the pipe operator %>% to chain method calls on the data frame data.
share
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Wildcards in jQuery selectors
...odelForm class dictates IDs based on models, and doesn't seem to allow for grouping like this; i.e. the HTML is out of my control.
– Christian Mann
Jun 12 '12 at 16:07
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