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How to convert a PNG image to a SVG? [closed]
...le = 2017.pnm
potrace 2017.pnm -s -o 2017.svg
Output file = 2017.svg
Script
ykarikos proposes a script png2svg.sh that I have improved:
#!/bin/bash
File_png="${1?:Usage: $0 file.png}"
if [[ ! -s "$File_png" ]]; then
echo >&2 "The first argument ($File_png)"
echo >&2 "must...
MySQL - UPDATE query based on SELECT Query
...ore the intermediate result. (had to write a similar query for a migration script)
– svvac
Sep 21 '17 at 13:39
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show 3 more comments
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Allowed memory size of 33554432 bytes exhausted (tried to allocate 43148176 bytes) in php
...panidarapu and @Don Jones: Depending on the amount of memory, and how this script is used, it could be dangerous to allow the change in memory usage in this way. Don, in your case, you can likely break the feed down into smaller chunks and parse what you need. Glad it works, but be careful.
...
Understanding exactly when a data.table is a reference to (vs a copy of) another data.table
...od does. When wrapped with invisible() or when called within a function or script, the print method isn't called.
All this applies inside functions too; i.e., := and set() do not copy on write, even within functions. If you need to modify a local copy, then call x=copy(x) at the start of the funct...
Creating and throwing new exception
...
If you are using try..catches in your script and you have multiple catch statements calling out specific exceptions then, of course, you would want to specify the exception type. I'm not certain why a reference is made to C++. In Powershell scripting, a throw sta...
jQuery multiple events to trigger the same function
...ation is important, and may (or may not) be required depending on when the script is loaded / run, and if the elements exist in the DOM at the time the script is loaded / run.
– random_user_name
Jan 11 '17 at 16:57
...
What is the (function() { } )() construct in JavaScript?
...n is executed right after it's created, not after it is parsed. The entire script block is parsed before any code in it is executed. Also, parsing code doesn't automatically mean that it's executed, if for example the IIFE is inside a function then it won't be executed until the function is called.
...
Do htmlspecialchars and mysql_real_escape_string keep my PHP code safe from injection?
...< or > to do anything dangerous. Our attack vector could just be javascript:alert(document.cookie)
Now resultant HTML looks like
<img src= "javascript:alert(document.cookie)" />
The attack gets straight through.
It gets worse. Why? because htmlspecialchars (when called this way) on...
How can javascript upload a blob?
... actually don't have to use FormData to send a Blob to the server from JavaScript (and a File is also a Blob).
jQuery example:
var file = $('#fileInput').get(0).files.item(0); // instance of File
$.ajax({
type: 'POST',
url: 'upload.php',
data: file,
contentType: 'application/my-binary-typ...
git: How to ignore all present untracked files?
...hort because manual states "Give the output in an easy-to-parse format for scripts. This is similar to the short output, but will remain stable across git versions and regardless of user configuration." So we have both the parseability and stability;
grep '^??' filters only the lines starting with ?...