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How to check if a file exists before deleting?


How to check if a file exists before deleting?

By : K_Donghan
Date : November 21 2020, 03:00 PM
it fixes the issue I'm trying to create a script where if I file exists then perform a delete and then get a wget from artifactory. Running this code below for some reason will not delete my file and creates a new one with an extension ...example cageo.crt.1 , .2, .3, etc. , Remove the space when assigning variables in shell. It should read,
code :
file="cageo.crt"
if [ -f "$file" ]; 


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How to check if directory exists before deleting it, using ANT?

How to check if directory exists before deleting it, using ANT?


By : user3181518
Date : March 29 2020, 07:55 AM
it helps some times Nice and clean solution below: Using ant-contribs.jar
When using this solution, be sure to put the following line on top
code :
<!-- For <if> statements -->
<taskdef resource="net/sf/antcontrib/antlib.xml" />

<!-- Remove distribution directories and their content for a clean build --> <target name="clean" description="clean"> <if> <available file="${build}" type="dir" /> <then> <delete dir="${build}" /> </then> </if> </target>
Check if a value exists before deleting with prepared statement

Check if a value exists before deleting with prepared statement


By : soh335
Date : March 29 2020, 07:55 AM
hope this fix your issue I'd like to get notified when a movie does not exists. This represents a script to delete movies from the database. This is a part of what I have now: , How about the following:
code :
if (mysqli_stmt_affected_rows($delMovie) == 0) then
  echo "Error: Movie does not exists in database";
1) Do a select statement to check for existence
2) If not exists
   a) Show error
   b) Delete
       - If error deleting, show error
       - Else show success
1) Delete
    - If 0 rows affected or error, Show error message
    - Else show success
C++ Should I check whether a file exists before deleting it?

C++ Should I check whether a file exists before deleting it?


By : Jose Fabian Benavide
Date : March 29 2020, 07:55 AM
around this issue Quite simply, I want to delete a file that may or may not exist. Is it bad practice to just use remove(filename) and ignore the return value? ,
Should I check whether a file exists before deleting it?
Check if widget exists in tkinter before deleting it

Check if widget exists in tkinter before deleting it


By : Daniel Odiase
Date : March 29 2020, 07:55 AM
I wish this helpful for you I am using a dropdown menu to create several widgets. I would like to check whether the widget exists (from a previous selection on the dropdown menu) before deleting it. I am using the following code: , I see three possible solutions. In order of preference:
Should I check if a user exists before deleting it?

Should I check if a user exists before deleting it?


By : Michael Koo
Date : March 29 2020, 07:55 AM
This might help you That depends upon _userManager.DeleteAsync implementation, since you are using .Net Core Identity, implementation of DeleteAsync method will throw ArgumentNullException
You can check source code here, and here is method's implementation:
code :
public virtual Task<IdentityResult> DeleteAsync(TUser user)
    {
        ThrowIfDisposed();
        if (user == null)
        {
            throw new ArgumentNullException(nameof(user));
        }

        return Store.DeleteAsync(user, CancellationToken);
    }
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