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How to drop a PostgreSQL database if there are active connections to it?
... all postgresql processes that are running by tying this command
sudo /etc/init.d/postgresql restart
type the command
bg to check if other postgresql processes are still running
then followed by dropdb dbname to drop the database
sudo /etc/init.d/postgresql restart
bg
dropdb dbname
Thi...
Git Tag list, display commit sha1 hashes
...ed but missing in it, like full tag details and tags in the commit history order.
I like this instead, which gives exactly what I want but can't get from git tag:
git log --oneline --decorate --tags --no-walk
This gives a very nice color-coded view of the tags in the reverse chronological order ...
case-insensitive list sorting, without lowercasing the result?
...e lowercase 'b' because Python's sort() and sorted() preserve the original order when strings match. In this case the capital 'B' is considered to match the lowercase 'b' when using casefold. This always happens if you convert case in order to compare: sorted(spam, key=str.lower) or sorted(spam, key...
iPhone viewWillAppear not firing
...vigationController and then pushing a view to it WILL fire viewWillAppear: etc.
– DaGaMs
Nov 7 '11 at 13:44
Swift 3: ...
Where should @Service annotation be kept? Interface or Implementation?
...
Basically annotations like @Service, @Repository, @Component, etc. they all serve the same purpose:
auto-detection when using annotation-based configuration and classpath
scanning.
From my experience I am always using @Service annotation on the interfaces or abstract classes an...
What is the purpose of shuffling and sorting phase in the reducer in Map Reduce Programming?
...nding K1,V2 and K1,V4 to different reducers as they need to be together in order to be reduced.
Tried explaining it as simply as possible
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How to check if a symlink exists
... just test to see if it exists regardless of type (file, directory, socket etc) then use -e
So if file is really file and not just a symbolic link you can do all these tests and
get an exit status whose value indicates the error condition.
if [ ! \( -e "${file}" \) ]
then
echo "%ERROR: file $...
What's “requestCode” used for on PendingIntent?
...sed to retrieve the same pending intent instance later on (for cancelling, etc).
Yes, my guess is the alarms will override each other. I would keep the request codes unique.
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How do CDI and EJB compare? interact?
...a EE 6 compliant server has it (Glassfish 3.0.1+ is not mistaken, JBoss 6+ etc.) You can take a look at JBoss Weld, a reference CDI implementation which you can use in for instance Tomcat...
– Maxym
Aug 13 '14 at 13:47
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How to create a bash script to check the SSH connection?
...at all about the commands... or what you are actually doing.. what is $? ? etc
– Toskan
Jan 18 '18 at 21:19
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