大约有 47,000 项符合查询结果（耗时：0.0583秒） [XML]
Check if an apt-get package is installed and then install it if it's not on Linux
I'm working on a Ubuntu system and currently this is what I'm doing:
22 Answers
22
...
How to run a background task in a servlet based web application?
I'm using Java and I want to keep a servlet continuously running in my application, but I'm not getting how to do it. My servlet has a method which gives counts of the user from a database on a daily basis as well as the total count of the users from the whole database. So I want to keep the servlet...
What is a 'semantic predicate' in ANTLR?
...ng of at least
// one number, optionally followed by zero or more comma's and numbers
parse
: number (',' number)* EOF
;
// matches a number that is between 1 and 3 digits long
number
: Digit Digit Digit
| Digit Digit
| Digit
;
// matches a single digit
Digit
: '0'..'9'
;
//...
Show filename and line number in grep output
... to search my rails directory using grep. I am looking for a specific word and I want to grep to print out the file name and line number.
...
Dictionaries and default values
...nguage is that the interpreter would be able to 'see' inside the functions and optimize it - that the user wouldn't have to deal with micro-optimizations as much. Isn't that what things like JIT compilation are for?
– nishantjr
Oct 27 '14 at 7:32
...
What is the largest TCP/IP network port number allowable for IPv4?
...ions. Microsoft wrote an interesting Technet article about how to diagnose and avoid it in Windows environments: blogs.technet.microsoft.com/askds/2008/10/29/…
– JessieArr
Jul 13 '16 at 20:04
...
Why should I use tags vs. release/beta branches for versioning?
I've been using git for about a year and would like to use tagging to, well, tag commits at different versions. I've found lots of info on the commands to use to work with tags, but what I'd like to know is why use tagging at all if I can just create a new branch called 1.1.0 and not have to cloud...
What is this crazy C++11 syntax ==> struct : bar {} foo {};?
...
First, we'll take a bog-standard abstract UDT (User-Defined Type):
struct foo { virtual void f() = 0; }; // normal abstract type
foo obj;
// error: cannot declare variable 'obj' to be of abstract type 'foo'
Let's also recall that we can instantiate...
Google Docs/Drive - number the headings
...ents should appear in your sidebar. Click on Heading Numbers Format menu, and choose 1.2.3
You have to reformat your document if you have an old one in order to 'refresh' the numbers, but actually the addon works very well.
I've seen the answer in this forum.
...
How to get object length [duplicate]
...to make sure that you're only counting properties from the object literal, and not properties it "inherits" from its prototype.
share
|
improve this answer
|
follow
...