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Using parameters in batch files at Windows command line
...r tokens that you can use:
%0 is the executable (batch file) name as specified in the command line.
%* is all parameters specified in the command line -- this is very useful if you want to forward the parameters to another program.
There are also lots of important techniques to be aware of in ad...
Compare two objects' properties to find differences?
...s tricky.
public bool ReflectiveEquals(object first, object second)
{
if (first == null && second == null)
{
return true;
}
if (first == null || second == null)
{
return false;
}
Type firstType = first.GetType();
if (second.GetType() != firstT...
What is the purpose of “&&” in a shell command?
...wo
the intent is to execute the command that follows the && only if the first command is successful. This is idiomatic of Posix shells, and not only found in Bash.
It intends to prevent the running of the second process if the first fails.
You may notice I've used the word "intent" - tha...
How can I convert String to Int?
...e to make decisions about the results of the parsing attempt:
int x = 0;
if (Int32.TryParse(TextBoxD1.Text, out x))
{
// you know that the parsing attempt
// was successful
}
If you are curious, the difference between Parse and TryParse is best summed up like this:
The TryParse metho...
Check Whether a User Exists
...n also check user by id command.
id -u name gives you the id of that user.
if the user doesn't exist, you got command return value ($?)1
And as other answers pointed out: if all you want is just to check if the user exists, use if with id directly, as if already checks for the exit code. There's no ...
Get the first item from an iterable that matches a condition
...
In Python 2.6 or newer:
If you want StopIteration to be raised if no matching element is found:
next(x for x in the_iterable if x > 3)
If you want default_value (e.g. None) to be returned instead:
next((x for x in the_iterable if x > 3), d...
Procedure expects parameter which was not supplied
...
In addition to the other answers here, if you've forgotten to put:
cmd.CommandType = CommandType.StoredProcedure;
Then you will also get this error.
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How can I check if a View exists in a Database?
I have some SQL code that needs to be executed if a certain View exists in a database. How would I go about checking if the View exists?
...
How to check if an object is nullable?
How do I check if a given object is nullable in other words how to implement the following method...
14 Answers
...
Does java.util.List.isEmpty() check if the list itself is null? [duplicate]
Does java.util.List.isEmpty() check if the list itself is null , or do I have to do this check myself?
8 Answers
...