Every so often I have to restore my gpg keys and I'm never sure how best to do it. So, I've spent some time playing around with the various ways to export/import (backup/restore) keys.
cp ~/.gnupg/pubring.gpg /path/to/backups/
cp ~/.gnupg/secring.gpg /path/to/backups/
cp ~/.gnupg/trustdb.gpg /path/to/backups/
| # create container with key authentication | |
| sudo lxc-create -t ubuntu -n test -- -S /root/.ssh/id_rsa.pub | |
| sudo lxc-start -n test -d | |
| sudo lxc-wait -n test -s RUNNING | |
| # enable passwordless sudo for ubuntu user | |
| chroot /var/lib/lxc/test/rootfs sh -c "echo 'ubuntu ALL=NOPASSWD:ALL' > /etc/sudoers.d/ubuntu; chmod 440 /etc/sudoers.d/ubuntu" | |
| # now you can run commands in container, example: install avahi-daemon | |
| ssh `cat /var/lib/misc/dnsmasq.leases | grep --word-regexp test | awk '{print $3}'` -l ubuntu -o "StrictHostKeyChecking no" sudo apt-get install -y avahi-daemon |
| #!/bin/bash | |
| LOCAL_BRANCH=$1 | |
| REMOTE_BRANCH="${2:-origin}/$1" | |
| if [ x"$(git rev-parse $LOCAL_BRANCH)" != x"$(git rev-parse $REMOTE_BRANCH)" ] | |
| then | |
| echo "$LOCAL_BRANCH is not in sync with $REMOTE_BRANCH. You may want to rebase or push first." | |
| fi |
| chmod cheat sheet | |
| PERMISSION COMMAND | |
| U G W | |
| _____________________________________ | |
| |rwx rwx rwx chmod 777 <filename> | | |
| |_____________________________________| | |
| |rwx rwx r-x chmod 775 <filename> | | |
| |_____________________________________| |
| Below are the Big O performance of common functions of different Java Collections. | |
| List | Add | Remove | Get | Contains | Next | Data Structure | |
| ---------------------|------|--------|------|----------|------|--------------- | |
| ArrayList | O(1) | O(n) | O(1) | O(n) | O(1) | Array | |
| LinkedList | O(1) | O(1) | O(n) | O(n) | O(1) | Linked List | |
| CopyOnWriteArrayList | O(n) | O(n) | O(1) | O(n) | O(1) | Array | |
Using grep (well, pcregrep) to display the labels of reference style links in a Markdown document:
$ pcregrep --only-matching=1 \ # Only display the match from group 1
"\[.*?\](\[.*?\])" \ # Find [text][label] reference style links
/path/to/document.md | \ # Path to the markdown document
sort # Optionally sort the output
I had the regexp working in grep but couldn't capture just the group I was interested in. This Stack Overflow answer suggested pcregrep.
| <!doctype html> | |
| <html lang=en> | |
| <head> | |
| <meta charset=utf-8> | |
| <title>Copy To Clipboard Example</title> | |
| </head> | |
| <body> | |
| <input id="txtToCopy" type="text"> | |
| <button id="btnCopy">Copy!</button> |
| import contextlib | |
| import OpenSSL.crypto | |
| import os | |
| import requests | |
| import ssl | |
| import tempfile | |
| @contextlib.contextmanager | |
| def pfx_to_pem(pfx_path, pfx_password): | |
| ''' Decrypts the .pfx file to be used with requests. ''' |
warning: ignoring broken ref refs/remotes/origin/HEAD
➜ ✗ g symbolic-ref refs/remotes/origin/HEAD refs/remotes/origin/develop
➜ ✗ g fetch --prune
➜ ✗ g gc