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Getting an empty JQuery object
...ty jQuery-object:
$([])
Update:
In newer versions of jQuery (1.4+), you can use:
$()
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Can I use an OR in regex without capturing what's enclosed?
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Depending on the regular expression implementation you can use so called non-capturing groups with the syntax (?:…):
((?:a|b)c)
Here (?:a|b) is a group but you cannot reference its match. So you can only reference the match of ((?:a|b)c) that is either ac or bc.
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Getting pids from ps -ef |grep keyword
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You can use pgrep as long as you include the -f options. That makes pgrep match keywords in the whole command (including arguments) instead of just the process name.
pgrep -f keyword
From the man page:
-f The patt...
jquery how to empty input field
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You can clear the input field by using $('#shares').val('');
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str performance in python
... to 3.2 ), I discovered that the
str method to convert an object (in my case an integer) to a string is almost an order of magnitude slower than using string formatting.
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Setting environment variables for accessing in PHP when using Apache
I have a Linux environment and I have a PHP Web Application that conditionally runs based on environment variables using getenv in PHP. I need to know how these environment variables need to be set for the application to work correctly. I am not sure how to set this up on Apache.
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What is the difference between double-ampersand (&&) and semicolon (;) in Linux Bash?
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@CharlieParker & causes the command to be run in the background, so yes. "Run this in the background" is very different from "run this next command only if this other one succeeds."
– cdhowie
Jan 18 '17...
keep rsync from removing unfinished source files
...s is Linux, it's possible for a file to be open by process A and process B can unlink the file. There's no error, but of course A is wasting its time. Therefore, the fact that rsync deletes the source file is not a problem.
The problem is rsync deletes the source file only after it's copied, and ...
How to use CMAKE_INSTALL_PREFIX
...with install target, making installation to /usr instead of default /usr/local. Assuming that build directory is done in the source subdirectory, I execute:
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How to make Scroll From Source feature always enabled?
...telliJ IDEA so it is always on, meaning if you open any file it is automatically shown in Project view, likewise it is made in Eclipse?
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