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How can I check if a command exists in a shell script? [duplicate]
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In general, that depends on your shell, but if you use bash, zsh, ksh or sh (as provided by dash), the following should work:
if ! type "$foobar_command_name" > /dev/null; then
# install foobar here
fi
For a real installation script, you'd probably want to be sure that type doesn't retu...
How to test code dependent on environment variables using JUnit?
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The library System Lambda has a method withEnvironmentVariables for setting environment variables.
public void EnvironmentVariablesTest {
@Test
public void setEnvironmentVariable() {
String value = withEnvironmentVariable("name", "value")
.execute(() -> System.getenv("name...
How to dismiss a Twitter Bootstrap popover by clicking outside?
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Update: A slightly more robust solution: http://jsfiddle.net/mattdlockyer/C5GBU/72/
For buttons containing text only:
$('body').on('click', function (e) {
//did not click a popover toggle or popover
if ($(e.target).data('toggle') !== '...
Extracting just Month and Year separately from Pandas Datetime column
...ivalDate']).year
df['month'] = pd.DatetimeIndex(df['ArrivalDate']).month
or...
df['year'] = df['ArrivalDate'].dt.year
df['month'] = df['ArrivalDate'].dt.month
Then you can combine them or work with them just as they are.
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Is there a “null coalescing” operator in JavaScript?
Is there a null coalescing operator in Javascript?
13 Answers
13
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Regex to replace multiple spaces with a single space
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This is not working when a blank instead of a tab or newline is needed. Right? /\s+/ would be working.
– Fabian
Feb 20 '13 at 11:01
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IPN vs PDT in Paypal
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The APIs for PDT and IPN are similar. The main difference is when you receive the notification. For that reason I would recommend implementing both.
With PDT you get the notification instantly and can do any additional processing r...
Do on-demand Mac OS X cloud services exist, comparable to Amazon's EC2 on-demand instances? [closed]
...t I haven't found a service offering a similar "rent by the hour" service for a remote Mac OS X virtual machine. Does such a service exist? (iCloud looks to be just a data storage service, rather than a service allowing remote login, etc.)
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PHP Get Site URL Protocol - http vs https
...t site url protocol but I don't have SSL and don't know how to test if it works under https. Can you tell me if this is correct?
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What is the best method of handling currency/money?
I'm working on a very basic shopping cart system.
13 Answers
13
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