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What is the difference between PS1 and PROMPT_COMMAND
...ue of the last executed program. This is convenient to see if there was an error and the error code of the last program I ran in the terminal. Note the outer ' surrounding the entire PROMPT_COMMAND expression. It includes PS1 so that this variable is re-evaluated each time the PROMPT_COMMAND variabl...
Update Git submodule to latest commit on origin
... commands using && - meaning previous command must execute without error.
After a possible successful pull (if new stuff was found on the remote), I do a push to ensure that a possible merge-commit is not left behind on the client. Again, it only happens if a pull actually brought in new st...
How to save a BufferedImage as a File
...try block because, as per the API, the method throws an IOException "if an error occurs during writing"
Also explained are the method's objective, parameters, returns, and throws, in more detail:
Writes an image using an arbitrary ImageWriter that supports the given format to a File. If there is al...
How to show line number when executing bash script
...ut, I use set -x or set -v and set -e , so the script would stop when error occurs. However, it's still rather difficult for me to locate which line did the execution stop in order to locate the problem.
Is there a method which can output the line number of the script before each line is execut...
Why is null an object and what's the difference between null and undefined?
... variables, however, produces an exception:
> unknownVariable
ReferenceError: unknownVariable is not defined
null: used by programmers to indicate “no value”, e.g. as a parameter to a function.
Examining a variable:
console.log(typeof unknownVariable === "undefined"); // true
var foo;
c...
Should “node_modules” folder be included in the git repository
...some remote server (e.g. for backup) cleaning it up is another painful and error-prone task you'd be running into.
Thus, if you care for efficient processes and like to keep things "small" I'd rather use a separate artifacts repository such as Nexos Repository (or just some HTTP server with ZIP ar...
Java ArrayList - how can I tell if two lists are equal, order not mattering?
... @jschoen Trying to do Collections.sort() is giving me this error: Bound mismatch: The generic method sort(List<T>) of type Collections is not applicable for the arguments (ArrayList<Answer>). The inferred type Answer is not a valid substitute for the bounded parameter <...
Safe (bounds-checked) array lookup in Swift, through optional bindings?
...to access an index that is out of bounds, there is an unsurprising runtime error:
19 Answers
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IllegalArgumentException or NullPointerException for a null parameter? [closed]
...hing different as a result? Are you trying to communicate a more specific error message? But you can do that in the exception message text anyway, as you should for all other incorrect parameters.
Fourth, all other incorrect parameter data will be IAE, so why not be consistent? Why is it that an...
Does Python have “private” variables in classes?
...t will fail:
>>>x = A()
>>>x.__var # this will return error: "A has no attribute __var"
>>>x.printVar() # this gives back 123
But you can easily get away with this:
>>>x.__dict__ # this will show everything that is contained in object x
# w...