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Checking Bash exit status of several commands efficiently
...been set to a command.
function mytest {
"$@"
local status=$?
if (( status != 0 )); then
echo "error with $1" >&2
fi
return $status
}
mytest "$command1"
mytest "$command2"
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Difference between & and && in Java? [duplicate]
I was just wondering what the difference between & and && is?
A few days I wrote a condition for an if statement the looked something like:
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I need to securely store a username and password in Python, what are my options?
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I recommend a strategy similar to ssh-agent. If you can't use ssh-agent directly you could implement something like it, so that your password is only kept in RAM. The cron job could have configured credentials to get the actual password from the agent each time it runs...
Force browser to download image files on click
...o download the image with the same file name (in this example image.png).
If you specify a value for this attribute, then that will become the new filename:
<a href="/path/to/image.png" download="AwesomeImage.png">
UPDATE: As of spring 2018 this is no longer possible for cross-origin hrefs....
BackgroundWorker vs background Thread
...d the ProgressChanged event to update the GUI on the threads progress.
So if you aren't making use of these, I don't see any harm in using a standard Thread for what you need to do.
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Getting multiple keys of specified value of a generic Dictionary?
... IList<TFirst> firsts;
IList<TSecond> seconds;
if (!firstToSecond.TryGetValue(first, out seconds))
{
seconds = new List<TSecond>();
firstToSecond[first] = seconds;
}
if (!secondToFirst.TryGetValue(second, out firsts))
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Can you require two form fields to match with HTML5?
...ng HTML5? Or does this still have to be done with javascript? For example, if you have two password fields and want to make sure that a user has entered the same data in each field, are there some attributes, or other coding that can be done, to achieve this?
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How to tell if JRE or JDK is installed
... tried it on another, it complained that JDK was required. How can I check if JDK was somehow installed on my system? Note: the computer in question is a Mac.
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Programmatically go back to the previous fragment in the backstack
...n().replace(R.id.content_frame,fragment).addToBackStack("tag").commit();" if you write addToBackStack(null) , it will handle it by itself but if you give a tag , you should handle it manually.
– Khaled Saif
Dec 8 '15 at 11:14
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Choose File Dialog [closed]
...log? Maybe one where you can filter out all files except for ones with specific extensions?
6 Answers
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