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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...
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...
How to allow to accept only image files?
...
Steps:
1. Add accept attribute to input tag
2. Validate with javascript
3. Add server side validation to verify if the content is really an expected file type
For HTML and javascript:
<html>
<body>
<input name="image" type="file" id="fileName" accept=".jpg,.jpeg,.png" onc...
How to extract the first two characters of a string in shell scripting?
For example, given:
14 Answers
14
...
Install NPM into home directory with distribution nodejs package (Ubuntu)
...ll -g as you would normally:
[justjake@marathon:~] $ npm install -g coffee-script
... (npm downloads stuff) ...
/home/justjake/.npm-packages/bin/coffee -> /home/justjake/.npm-packages/lib/node_modules/coffee-script/bin/coffee
/home/justjake/.npm-packages/bin/cake -> /home/justjake/.npm-package...
How does “cat
I needed to write a script to enter multi-line input to a program ( psql ).
9 Answers
...
What is Node.js? [closed]
...
I think the advantages are:
Web development in a dynamic language (JavaScript) on a VM that is incredibly fast (V8). It is much faster than Ruby, Python, or Perl.
Ability to handle thousands of concurrent connections with minimal overhead on a single process.
JavaScript is perfect for event loop...
Bash if statement with multiple conditions throws an error
I'm trying to write a script that will check two error flags, and in case one flag (or both) are changed it'll echo-- error happened. My script:
...
How do I list all files of a directory?
...In this case, it shows the files only in the current directory
# where the script is executed.
import os
with os.scandir() as i:
for entry in i:
if entry.is_file():
print(entry.name)
>>> ebookmaker.py
>>> error.PNG
>>> exemaker.bat
>>> gu...
How can I expand the full path of the current file to pass to a command in Vim?
...ame dirname
:echo expand("<sfile>:p") " absolute path to [this] vimscript
:help filename-modifiers
For example (with a vim function), to resolve() and expand() any symlinks to the absolute path to the current script <sfile>:p (instead of %:p), and then exec to source the fnameescape...