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Test for non-zero length string in Bash: [ -n “$var” ] or [ “$var” ]
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Edit: This is a more complete version that shows more differences between [ (aka test) and [[.
The following table shows that whether a variable is quoted or not, whether you use single or double brackets and whether the variable contains o...
How do I parse XML in Python?
...andard library itself; but, in this context, what they chiefly add is even more speed -- the ease of programming part depends on the API, which ElementTree defines.
First build an Element instance root from the XML, e.g. with the XML function, or by parsing a file with something like:
import xml.e...
Comparing HTTP and FTP for transferring files
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Here's a performance comparison of the two. HTTP is more responsive for request-response of small files, but FTP may be better for large files if tuned properly. FTP used to be generally considered faster. FTP requires a control channel and state be maintained besides the TC...
Why are Standard iterator ranges [begin, end) instead of [begin, end]?
...ge to be a simple difference end − begin;
including the lower bound is more "natural" when sequences degenerate to empty ones, and also because the alternative (excluding the lower bound) would require the existence of a "one-before-the-beginning" sentinel value.
You still need to justify why ...
How to grep (search) committed code in the Git history
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In HTML I can make a checkmark with ✓ . Is there a corresponding X-mark?
...in IE 8... IE 9, FireFox, and Chrome work correctly. Here's a good link to more symbols: danshort.com/HTMLentities/index.php?w=dingb
– Nathan Prather
Aug 26 '12 at 15:25
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How to prevent robots from automatically filling up a form?
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Get the time difference between two datetimes
I know I can do anything and some more envolving Dates with momentjs. But embarrassingly, I'm having a hard time trying to do something that seems simple: geting the difference between 2 times.
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LaTeX table positioning
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After doing some more googling I came across the float package which lets you prevent LaTeX from repositioning the tables.
In the preamble:
\usepackage{float}
\restylefloat{table}
Then for each table you can use the H placement option (e....
angular ng-repeat in reverse
... that the variable is an array before performing the reverse, or making it more lenient to allow the reversal of more things such as strings.
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