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How to find whether or not a variable is empty in Bash
How can I check if a variable is empty in Bash?
10 Answers
10
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Getting an “ambiguous redirect” error
...ly the same error:
$ echo hello >
bash: syntax error near unexpected token `newline`
$ echo hello > ${NONEXISTENT}
bash: ${NONEXISTENT}: ambiguous redirect
$ echo hello > "${NONEXISTENT}"
bash: : No such file or directory
Adding quotes around the variable seems to be a good way to deal...
Get PHP class property by string
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Like this
<?php
$prop = 'Name';
echo $obj->$prop;
Or, if you have control over the class, implement the ArrayAccess interface and just do this
echo $obj['Name'];
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How do I read CSV data into a record array in NumPy?
...You can use Numpy's genfromtxt() method to do so, by setting the delimiter kwarg to a comma.
from numpy import genfromtxt
my_data = genfromtxt('my_file.csv', delimiter=',')
More information on the function can be found at its respective documentation.
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Get current folder path
I want to create a program that converts files. I would like the user to be able to place the executable file in any directory, and when executing that program (double-clicking on the .exe) I want the program to process all the files within the current folder where the exe file exists . How can the...
Function to clear the console in R and RStudio
...s a function to clear the console in R and, in particular, RStudio I am looking for a function that I can type into the console, and not a keyboard shortcut.
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How can “while (i == i) ;” be a non-infinite loop in a single threaded application?
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Zach ScrivenaZach Scrivena
26.8k1010 gold badges5959 silver badges7171 bronze badges
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Should I choose ActivePerl or Strawberry Perl for Windows? [duplicate]
I'm totally new to Perl, but I'd like to try it out. I read about two rival distributions available for Windows platform (I guess there's just Perl on other OSes :).
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How do you change the size of figures drawn with matplotlib?
... figure
figure(num=None, figsize=(8, 6), dpi=80, facecolor='w', edgecolor='k')
figure(figsize=(1,1)) would create an inch-by-inch image, which would be 80-by-80 pixels unless you also give a different dpi argument.
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How to escape double quotes in a title attribute
...amp;quot;text&quot;">Hover me</a>
Is correct and it works as expected - you see normal quotes in rendered page.
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