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What's the difference between Perl's backticks, system, and exec?
...nc,
because it is a function.
system
executes a command and your Perl script is continued after the command has finished.
The return value is the exit status of the command.
You can find documentation about it in perlfunc.
backticks
like system executes a command and your perl script is c...
wkhtmltopdf: cannot connect to X server
... called xvfb.
sudo apt-get install xvfb
We need to write a little shell script to wrap wkhtmltopdf in xvfb. Make a file called wkhtmltopdf.sh and add the following:
xvfb-run -a -s "-screen 0 640x480x16" wkhtmltopdf "$@"
Move this shell script to /usr/local/bin, and set permissions:
sudo chmod...
Ways to circumvent the same-origin policy
...shorter domain is used for subsequent origin checks. For example, assume a script in the document at http://store.company.com/dir/other.html executes the following statement:
document.domain = "company.com";
After that statement executes, the page would pass the origin check with http://company.c...
Python executable not finding libpython shared library
...library error mentioned in this question when I tried running a simple CGI script:
tail /var/log/httpd/error_log
AH01215: /opt/rh/rh-python35/root/usr/bin/python: error while loading shared libraries: libpython3.5m.so.rh-python35-1.0: cannot open shared object file: No such file or directory
I wa...
About catching ANY exception
...ht and swallowed those then you could make it hard for anyone to exit your script.
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jQuery selector regular expressions
...n() {
return this.id.match(/abc+d/);
})
.html("Matched!");
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="abcd">Not matched</div>
<div id="abccd">Not matched</div>
<div id="abcccd">Not matc...
Is there a null-coalescing (Elvis) operator or safe navigation operator in javascript?
...operator:
For example displayname = user.name || "Anonymous" .
But Javascript currently doesn't have the other functionality. I'd recommend looking at CoffeeScript if you want an alternative syntax. It has some shorthand that is similar to what you are looking for.
For example The Existential...
How to extract the first two characters of a string in shell scripting?
For example, given:
14 Answers
14
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How to use the 'main' parameter in package.json?
...ge
folder.
For most modules, it makes the most sense to have a main script and
often not much else.
To put it short:
You only need a main parameter in your package.json if the entry point to your package differs from index.js in its root folder. For example, people often put the entry p...
Remove Identity from a column in a table
...
@simon if you script out your changes, you'll see SSMS is actually creating a copy of the table w/o the identity property.
– Code Magician
Nov 22 '11 at 16:47
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