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What's a concise way to check that environment variables are set in a Unix shell script?
I've got a few Unix shell scripts where I need to check that certain environment variables are set before I start doing stuff, so I do this sort of thing:
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abort, terminate or exit?
What's the difference between those three, and how shall I end program in case of exception which I can't handle properly?
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Is there a link to the “latest” jQuery library on Google APIs? [duplicate]
I use the following for a jQuery link in my <script> tags:
12 Answers
12
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How to find out what character key is pressed?
...hat character key is pressed in a cross-browser compatible way in pure Javascript.
8 Answers
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Create timestamp variable in bash script
I am trying to create a timestamp variable in a shell script to make the logging a little easier. I want to create the variable at the beginning of the script and have it print out the current time whenever I issue echo $timestamp . It proving to be more difficult then I thought. Here are some thin...
Using curl POST with variables defined in bash script functions
...d be quoted.
First, write a function that generates the post data of your script. This saves you from all sort of headaches concerning shell quoting and makes it easier to read an maintain the script than feeding the post data on curl's invocation line as in your attempt:
generate_post_data()
{
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Cron jobs and random times, within given hours
I need the ability to run a PHP script 20 times a day at completely random times. I also want it to run only between 9am - 11pm.
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What is the difference between cout, cerr, clog of iostream header in c++? When to use which one?
...read that clog also outputs to cerr. So based on that, which one do you choose? If clog is normally for "logging", why would I want that to go to the error stream? Logs seem more like "normal logs" (a.k.a. cout) than errors.
– void.pointer
Aug 11 '17 at 15:27
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Will iOS launch my app into the background if it was force-quit by the user?
...E2:
You can achieve this using the new PushKit framework, introduced in iOS 8. Though PushKit is used for VoIP. So your usage should be for VoIP related otherwise there is risk of app rejection. (See this answer).
UDPDATE1:
The documentation has been clarified for iOS8. The documentation can b...
What does $@ mean in a shell script?
What does a dollar sign followed by an at-sign ( @ ) mean in a shell script?
6 Answers
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