大约有 31,500 项符合查询结果（耗时：0.0564秒） [XML]
Assigning default values to shell variables with a single command in bash
...
Very close to what you posted, actually:
FOO=${VARIABLE:-default} # If variable not set or null, use default.
Or, which will assign default to VARIABLE as well:
FOO=${VARIABLE:=default} # If variable not set or null, set it to default.
...
Getting the HTTP Referrer in ASP.NET
... look with reflector shows that UrlReferrer does a lot more than a simple call to ServerVariables("HTTP_REFERER")
– Diadistis
Nov 23 '10 at 16:42
13
...
How to add external library in IntelliJ IDEA?
...ory had only out and src directories in it. So I created a new directory called "libs", and put the jar in it. But I don't know if this is what the direction intended... Then "Refresh project so libs show up in the structure". I could find no command to "refresh". How does one refresh a project...
Objective-C pass block as parameter
...laration style does not make it clear and easy to write the actual method call with a real block argument.
– uchuugaka
Feb 18 '13 at 22:56
...
Writing a Python list of lists to a csv file
...It kinda makes sense in hindsight, but not informative of where to look at all.
– Rambatino
May 25 '18 at 7:30
...
Get Substring between two characters using javascript
...
Trivial solution but handy especially if you want to avoid regular expressions.
– Nikolay Frick
Jun 24 '15 at 20:59
10
...
What does the Subversion status symbol “~” mean?
...t has been replaced by different kind of object.
So perhaps it was originally a single file, but you changed it to a directory, or something along those lines?
share
|
improve this answer
...
Rake just one migration
...n a single migration that changed and needed to be re-run independently of all other migrations. Fire up the console and do this:
>> require 'db/migrate/your_migrations.rb'
=> ["YourMigrations"]
>> YourMigrations.up
=> etc... as the migration runs
>> YourMigration.down
Mor...
Extract date (yyyy/mm/dd) from a timestamp in PostgreSQL
...swered May 26 '11 at 2:40
James AllmanJames Allman
37.4k99 gold badges5252 silver badges6969 bronze badges
...
Getting HTTP code in PHP using curl
...
First make sure if the URL is actually valid (a string, not empty, good syntax), this is quick to check server side. For example, doing this first could save a lot of time:
if(!$url || !is_string($url) || ! preg_match('/^http(s)?:\/\/[a-z0-9-]+(.[a-z0-9-]+)*...