大约有 38,425 项符合查询结果（耗时：0.0410秒） [XML]
How to test an Internet connection with bash?
...
#!/bin/bash
echo -e "GET http://google.com HTTP/1.0\n\n" | nc google.com 80 > /dev/null 2>&1
if [ $? -eq 0 ]; then
echo "Online"
else
echo "Offline"
fi
share
|
improve this ans...
download and install visual studio 2008 [closed]
...
Visual Studio 2008: (3,30 GB)
http://download.microsoft.com/download/8/1/d/81d3f35e-fa03-485b-953b-ff952e402520/VS2008ProEdition90dayTrialENUX1435622.iso
MSDN Library 2008: (2,15 GB)
http://www.microsoft.com/downloads/info.aspx?na=90&p=&...
How do I share IntelliJ Run/Debug configurations between projects?
...
186
The best way to do this is to click the "share" checkmark next to Name field when you edit/crea...
Why is sizeof considered an operator?
...
181
Because the C standard says so, and it gets the only vote.
As consequences:
The operand of s...
How do I replace NA values with zeros in an R dataframe?
...eplace = TRUE), 10)
> d <- as.data.frame(m)
V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
1 4 3 NA 3 7 6 6 10 6 5
2 9 8 9 5 10 NA 2 1 7 2
3 1 1 6 3 6 NA 1 4 1 6
4 NA 4 NA 7 10 2 NA 4 1 8
5 1 2 4 NA 2 6 2 6 7 4
6 NA 3 NA NA 10 2 1 10 8 4
7 4 4 9 ...
Convert data.frame column to a vector?
...
8
[..., drop = F] will always return a data frame
– hadley
Aug 16 '11 at 18:19
...
Spring Expression Language (SpEL) with @Value: dollar vs. hash ($ vs. #)
...
edited Aug 11 '15 at 19:18
nlucaroni
44.3k44 gold badges5757 silver badges8484 bronze badges
answered M...
How to parameterize @Scheduled(fixedDelay) with Spring 3.0 expression language?
...
answered Apr 8 '10 at 19:08
Grzegorz OledzkiGrzegorz Oledzki
20k1414 gold badges6060 silver badges9393 bronze badges
...
Use IntelliJ to generate class diagram
...
|
edited Aug 3 '18 at 18:27
answered Jan 20 '12 at 14:29
...
Ruby/Rails: converting a Date to a UNIX timestamp
...xample:
>> Date.new(2009,11,26).to_time
=> Thu Nov 26 00:00:00 -0800 2009
>> Date.new(2009,11,26).to_time.to_i
=> 1259222400
>> Time.at(1259222400)
=> Thu Nov 26 00:00:00 -0800 2009
Note that the intermediate DateTime object is in local time, so the timestamp might be a...