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Unicode equivalents for \w and \b in Java regular expressions?
...Y, and because the and is higher in precedence than or, that is simply AB|CD. So every \b that means a boundary can be safely replaced with:
(?:(?<=\w)(?!\w)|(?<!\w)(?=\w))
with the \w defined in the appropriate way.
(You might think it strange that the A and C components are opposi...
What is the difference between declarative and procedural programming paradigms?
... 10 ec2 instances like this:
-ec2:
count: 10
image: ami-058c6e5b73b074cd2
instance_type: t2.micro
If you were to run that file twice, you would end up with 20 t2.micro ec2 instances. If you wrote the equivalent in a declarative language like terraform and ran it twice you would only have 10...
Git commit with no commit message
... more, read "A Note About Git Commit Messages".
If you open Terminal.app, cd to your project directory, and git commit -am '', you will see that it fails because an empty commit message is not allowed. Newer versions of git have the
--allow-empty-message commandline argument, including the version ...
Changing MongoDB data store directory
... start
# test if mongodb user can access new location:
sudo -u mongodb -s cd /new/disk/mongodb/
# resolve other permissions issues if necessary
sudo usermod -a -G <newdisk_grp> mongodb
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...
Deleting all pending tasks in celery / rabbitmq
...eryev.c66a9bed-84bd-40b0-8fe7-4e4d0c002866 0 1
celeryev.b490f71a-be1a-4cd8-ae17-06a713cc2a99 0 1
celeryev.9d023165-ab4a-42cb-86f8-90294b80bd1e 0 1
The first column is the queue name, the second is the number of messages waiting in the queue, and the third is the number of listeners for...
How do I increase the scrollback buffer in a running screen session?
...What you need to know is if the file is not created ! You create it !
> cd ~ && vim .screenrc
And you add defscrollback 1000000 to it!
Or in one command
> echo "defscrollback 1000000" >> .screenrc
(if not created already)
Taking effect
When you add the default to .screenrc! The...
How to clone git repository with specific revision/changeset?
...
$ git clone $URL
$ cd $PROJECT_NAME
$ git reset --hard $SHA1
To again go back to the most recent commit
$ git pull
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improve this an...
ERROR 1396 (HY000): Operation CREATE USER failed for 'jack'@'localhost'
...te jack)
CREATE USER 'jack'@'localhost' IDENTIFIED BY PASSWORD '*Fi47ytFF3CD5B14E7EjkjkkC1D3F8086A5C0-krn';
(Get out of this situation by running DROP USER)
DROP USER 'jack'@'localhost';
(I suppose FLUSH PRIVILEGES can't hurt, but definitely drop the user first.)
...
How to find the largest file in a directory and its subdirectories?
...| sort -n -r | head -n 10
If you want more human readable output try:
$ cd /path/to/some/var
$ du -hsx * | sort -rh | head -10
Where,
Var is the directory you wan to search
du command -h option : display sizes in human readable format (e.g.,
1K, 234M, 2G).
du command -s option : show only a ...
How to revert a merge commit that's already pushed to remote branch?
...efore the wrong commit) from git log
git log -n5
output:
commit 7cd42475d6f95f5896b6f02e902efab0b70e8038 "Merge branch 'wrong-commit' into 'development'"
commit f9a734f8f44b0b37ccea769b9a2fd774c0f0c012 "this is a wrong commit"
commit 3779ab50e72908da92d2cfcd72256d7a09f446ba "this is ...