checking whether ports are being listened to
Git
current revision
# git rev-parse HEAD
commit diffs
git diff HEAD^ HEAD
see a file from 4 revisions ago
git show HEAD~4:src/main.c
List of remote branches
git ls-remote --heads origin
remove remote branch
git push origin --delete feature/xxx
Commits which are only in one branch :
git cherry -v develop mybranch
Files modified on a branch
git diff --name-only develop
Code review
git cherry -v develop feature/foo | gawk '{print $2}' | xargs git show
SSL
Displaying a certificate, example the one of gnupg.org
echo | openssl s_client -showcerts -servername gnupg.org -connect gnupg.org:443 2>/dev/null | openssl x509 -inform pem -noout -text
External ip address
curl ipinfo.io/ip
File permissions
On FreeBSD octal file permissions
stat -f "%0Lp" /foo/bar
On ubuntu
stat -c "%a %n" *
Restarting audio on apple
sudo launchctl stop com.apple.audio.coreaudiod
GPG
getting keygrip information for a particular homedir
gpg --homedir /home/blake/bla --fingerprint --with-keygrip blake@cyb.org
exporting a secret key
gpg --export-secret-keys --armor john@example.com > john-privkey.asc
exporting a public key
gpg --armor --export you@example.com > mykey.asc
encrypting a document using a key
gpg --output doc.gpg --encrypt --recipient blake@cyb.org doc
decrypting the document using a key
gpg --output doc --decrypt doc.gpg
