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Bash conditionals: how to “and” expressions? (if [ ! -z $VAR && -e $VAR ])
...$VAR is empty.
Your version does not work because it evaluates to [ -e ]. Now in this case, bash simply checks if the single argument (-e) is a non-empty string.
From the manpage:
test and [ evaluate conditional expressions using a set of rules based on the number of arguments. ...
1 argu...
How can I check if a program exists from a Bash script?
...y matter anymore and both type and hash become perfectly safe to use. type now has a -P to search just the PATH and hash has the side-effect that the command's location will be hashed (for faster lookup next time you use it), which is usually a good thing since you probably check for its existence i...
Amazon products API - Looking for basic overview and information
...web service has undergone two name changes in recent history: it was also known as ECS and AAWS.
The signature process you're referring to is the same HMAC signature that all of the other AWS services use for authentication. All that's required to sign your requests to the Product Advertising API is...
Which HTML5 reset CSS do you use and why? [closed]
...;
background: white;
}
Whats up with 1.5. And why background white?(I know it's for correcting but still not necessary)
Normalize.css: (Not normal)
https://github.com/necolas/normalize.css/blob/master/normalize.css
It started good with some webkit/ie hacks but
h1 {
font-size: 2em;
...
Google OAuth 2 authorization - Error: redirect_uri_mismatch
...c, because when I tried the same callback an hour ago, it didn't work, but now it's working. Anyway, thanks!
– user984621
Jul 14 '12 at 17:33
344
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Django: Get list of model fields?
...s such as a reverse ForeignKey and those are not exactly "fields". Anyone know how to distinguish the actual Fields?
– viridis
Jun 4 '13 at 13:56
2
...
Multiple Inheritance in PHP
...patcher that sends the Message passed using text or html backend. I don't know your code, but let me simulate it this way:
$m = new Message();
$m->type = 'text/html';
$m->from = 'John Doe <jdoe@yahoo.com>';
$m->to = 'Random Hacker <rh@gmail.com>';
$m->subject = 'Invitation e...
MySQL Select minimum/maximum among two (or more) given values
... watch out if NULL is likely to be in a field value ...
SELECT LEAST(NULL,NOW());
and
SELECT GREATEST(NULL,NOW());
both return null, which may not be what you want (especially in the case of GREATEST)
share
|...
htaccess redirect to https://www
...ll catch it.
RewriteRule .* https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
# Now, rewrite any request to the wrong domain to use www.
# [NC] is a case-insensitive match
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule .* https://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
About proxying
When behind s...
Windows batch file file download from a URL
...missions, let this stand as a perfect proof of concept that clicking on unknown .bat and .ps1 files can really screw up your stuff.
– 1934286
Nov 29 '18 at 23:22
...