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Postgresql: Scripting psql execution with password
...
PGPASSWORD=[your password] psql -Umyuser < myscript.sql
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How do I implement basic “Long Polling”?
...chance of returning an error 404 (to show error handling in the coming Javascript example)
msgsrv.php
<?php
if(rand(1,3) == 1){
/* Fake an error */
header("HTTP/1.0 404 Not Found");
die();
}
/* Send a string after a random number of seconds (2-10) */
sleep(rand(2,10));
echo("Hi! Ha...
How to tell if a string is not defined in a Bash shell script
...se it echoes nothing) "VAR is set but its value might be empty". Try this script:
(
unset VAR
if [ -z "${VAR+xxx}" ]; then echo JL:1 VAR is not set at all; fi
if [ -z "${VAR}" ]; then echo MP:1 VAR is not set at all; fi
VAR=
if [ -z "${VAR+xxx}" ]; then echo JL:2 VAR is not set at all; fi
if [ ...
Export and Import all MySQL databases at one time
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You can simplify/improve the script a bit: Replace the 9th line [databases=...] with these two lines: ExcludeDatabases="Database|information_schema|performance_schema|mysql" [next line] databases=`-u $USER -p$PASWORD -e "SHOW DATABASES;" | tr -d "| " | e...
RVM is not working in ZSH
...
Do you have this line in your ~/.zshrc?
[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm"
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Controlling the screenshot in the iOS 7 multitasking switcher
...ion, remove it from your views when entering the background. Also, dismiss alerts, temporary interfaces, and system view controllers that obscure your app’s content. The snapshot represents your app’s interface and should be recognizable to users. When your app returns to the foreground, you can...
Google MAP API Uncaught TypeError: Cannot read property 'offsetWidth' of null
...is problem is usually due to the map div not being rendered before the javascript runs that needs to access it.
You should put your initialization code inside an onload function or at the bottom of your HTML file, just before the tag, so the DOM is completely rendered before it executes (note that...
Can I install Python 3.x and 2.x on the same Windows computer?
...rs into %SYSTEMROOT% (C:\Windows) which is then associated with py and pyw scripts, respectively.
In order to use the new launcher (without manually setting up your own associations to it), leave the "Register Extensions" option enabled. I'm not quite sure why, but on my machine it left Py 2.7 as ...
Get current directory name (without full path) in a Bash script
How would I get just the current working directory name in a bash script, or even better, just a terminal command.
20 Answe...
jQuery remove all list items from an unordered list
...her error?
$('input').click(function() {
$('ul').empty()
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<ul>
<li>test</li>
<li>test</li>
</ul>
<input type="button" value="click me" ...