In Git you can add a submodule to a repository. This is basically a repository embedded in your main repository. This can be very useful. A couple of usecases of submodules:
- Separate big codebases into multiple repositories.
Magic words:
psql -U postgres
Some interesting flags (to see all, use -h
or --help
depending on your psql version):
-E
: will describe the underlaying queries of the \
commands (cool for learning!)-l
: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)# Key considerations for algorithm "RSA" ≥ 2048-bit
openssl genrsa -out server.key 2048
# Key considerations for algorithm "ECDSA" ≥ secp384r1
# List ECDSA the supported curves (openssl ecparam -list_curves)
ssh-keygen -t rsa -b 4096 -m PEM -f jwtRS256.key | |
# Don't add passphrase | |
openssl rsa -in jwtRS256.key -pubout -outform PEM -out jwtRS256.key.pub | |
cat jwtRS256.key | |
cat jwtRS256.key.pub |
Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...
// see: https://github.com/chadoe/docker-cleanup-volumes
$ docker volume rm $(docker volume ls -qf dangling=true)
$ docker volume ls -qf dangling=true | xargs -r docker volume rm
Jon Warbrick, July 2014, V3.2 (for Ansible 1.7)
First one found from of
If you work across many computers (and even otherwise!), it's a good idea to keep a copy of your setup on the cloud, preferably in a git repository, and clone it on another machine when you need.
Thus, you should keep the .vim
directory along with your .vimrc
version-controlled.
But when you have plugins installed inside .vim/bundle
(if you use pathogen), or inside .vim/pack
(if you use Vim 8's packages), keeping a copy where you want to be able to update the plugins (individual git repositories), as well as your vim-configuration as a whole, requires you to use git submodules.
Initialize a git repository inside your .vim
directory, add everything (including the vimrc), commit and push to a GitHub/BitBucket/GitLab repository:
cd ~/.vim