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List all environment variables from the command line
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Just do:
SET
You can also do SET prefix to see all variables with names starting with prefix.
For example, if you want to read only derbydb from the environment variables, do the following:
set derby
...and you will get the fo...
Chaining multiple MapReduce jobs in Hadoop
...assed in as arguments to your jobs with appropriate code to parse them and set up the parameters for the job.
I think that the above method might however be the way the now older mapred API did it, but it should still work. There will be a similar method in the new mapreduce API but i'm not sure wha...
change type of input field with jQuery
...ord field (type="password") and one a 'fake' password field (type="text"), setting the text in the fake field to a light gray color and setting the initial value to 'Password'. Then add a few lines of Javascript with jQuery as below:
<script type="text/javascript">
function pwdFo...
Preventing referenced assembly PDB and XML files copied to output
...L files. I was also using VS 2015. Build -> Advanced under Output -> set Debug Info to none under Output
– Devin Prejean
Mar 27 '17 at 17:18
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How do I import CSV file into a MySQL table?
I have an unnormalized events-diary CSV from a client that I'm trying to load into a MySQL table so that I can refactor into a sane format. I created a table called 'CSVImport' that has one field for every column of the CSV file. The CSV contains 99 columns , so this was a hard enough task in itself...
What is the difference between printf() and puts() in C?
I know you can print with printf() and puts() . I can also see that printf() allows you to interpolate variables and do formatting.
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Using regular expression in css?
...le way to select particular elements in css too...
#s1, #s2, #s3 {
// set css attributes here
}
if you only have a few elements to choose from, and dont want to bother with classes, this will work easily too.
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Changing column names of a data frame
...etter
1 1 -2.440467
2 2 1.320113
3 3 -0.306639
You can also subset:
R> colnames(X)[2] <- "superduper"
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Install tkinter for Python
... but the files are tiny and installation is very fast.
Then re-run python setup.py build and python setup.py install in your python installation directory - and it should work. It worked for me - and I can now import Tkinter etc to my heart's content - yipidy-yay. An entire afternoon spent on this ...
How to migrate back from initial migration in Django 1.7?
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