# gpg / ssh

## gpg

http://deferred.io/2017/08/03/yubikey4-gpg-ssh-u2f.html#how-i-use-my-yubikey-gnupg

```
gpg --list-secret-keys --keyid-format LONG
gpg --import
```

## git

## tmux

- https://tmuxcheatsheet.com/
- https://blog.bugsnag.com/tmux-and-vim/
- https://theworkaround.com/2016/08/29/setting-up-tmux-with-rails.html
- https://littlelines.com/blog/2014/09/02/seamlessly-navigate-rails-projects-with-tmux
- https://gist.github.com/gblmarquez/926c22db9e1702b1ad73

```
tmux new -s named-session
tmux -a named-session
```

`Ctrl + b` `I` to install/restart  
`Ctrl + b` `y` to yank  
`Ctrl + b` `o` to switch panes  
`Ctrl + b` `%` for a vertical pane  
`Ctrl + b` `"` for a horizontal pane

## vim

- `:sp` and `:vsp` for splits
- `Ctrl` + `w` for focus shifting, max/min with \_ and =

- ':set spell' activates vim spellchecker. Use '\]s' and '\[s' to move between mistakes, 'zg' adds to the dictionary, 'z=' suggests correctly spelled words

## fish

```  
chsh -s /usr/local/bin/fish
#edit /etc/shells  I think
chsh -s /bin/bash

curl https://git.io/fisher --create-dirs -sLo ~/.config/fish/functions/fisher.fish
```

> Once nice thing about Fish is a web-based configuration. Run `fish_config` to start the web client.

Consider further...

```  
set --universal fish_user_paths $fish_user_path ~/bin/
# Define alias in shell
alias rmi "rm -i"

# Define alias in config file
alias rmi="rm -i"

# This is equivalent to entering the following function:
function rmi
    rm -i $argv
end

# Then, to save it across terminal sessions:
funcsave rmi
```

## tools

- 'htop' instead of 'top'
- `ps aux | egrep '[t]erminal`'
- Pipe any command over 'column -t' to nicely align the columns
- 'file' gives information about a file, as image dimensions or text encoding
- 'watch'
- 'echo start_backup.sh | at midnight' starts a command at the specified time
- 'ranger' is a nice console file manager for vi fans https://ranger.github.io/
- linux: Use 'apt-file' to see which package provides that file you're missing
- if you liked the 'psgrep' alias, check 'pgrep' as it is far more powerful
- learn to use 'pushd' to save time navigating folders (j.py is better though) https://unix.stackexchange.com/questions/77077/how-do-i-use-pushd-and-popd-commands#77081
- 'dict' is a commandline dictionary
- Learn to use 'find' and 'locate' to look for files
- Compile your own version of 'screen' from the git sources. Most versions have a slow scrolling on a vertical split or even no vertical split at all
- 'trash-cli' sends files to the trash instead of deleting them forever. Be very careful with 'rm' or maybe make a wrapper to avoid deleting ' _' by_ accident (e.g. you want to type 'rm tmp_' but type 'rm tmp *')
- 'sort | uniq' to check for duplicate lines
- Google 'magic sysrq' and learn how to bring you machine back from the dead
- 'diff --side-by-side fileA.txt fileB.txt | pager' to see a nice diff
- 'j.py' http://tiny.cc/62qjow remembers your most used folders and is an incredible substitute to browse directories by name instead of 'cd'
- 'dropbox_uploader.sh' http://tiny.cc/o2qjow is a fantastic solution to upload by commandline via Dropbox's API if you can't use the official client

## docker

```  
DJANGO_DOCKER_ID=$( docker service ls | grep sportshi_dev_django | awk '{print $1}' )
echo $DJANGO_DOCKER_ID
docker exec -i $DJANGO_DOCKER_ID bash
```

```  
git commit --amend --reset-author --no-edit
```

## youtube-dl

```  
youtube-dl
youtube-dl --extract-audio --audio-format mp3 -o "% (title)s.%(ext)s" <url to playlist>
youtube-dl --extract-audio --audio-format mp3 -o "% (title)s.%(ext)s" https://www.youtube.com/playlist?list=PLeuCAdRSnObyIgsHQowMS0Of-tQmHbdFa
youtube-dl --extract-audio --audio-format mp3 -o "% (title)s.%(ext)s"
```

## mysql

```  
SELECT * INTO OUTFILE '/tmp/result.csv'
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'
LINES TERMINATED BY '\n'
FROM users;

prompt mysql (\d)-(\r:\m:\s)>;
CREATE USER 'stampede'@'%' IDENTIFIED BY 'password';
grant all on `stampede_%`.* to `stampede`@`%`;
\G
```

## bash

- In bash, 'ctrl-r' searches your command history as you type
- More in-line substitutions: http://tiny.cc/ecv0cw http://tiny.cc/8zbltw
- 'nohup ./long_script &' to leave stuff in background even if you logout

## Networking

check ports

```  
lsof -i -n -P | grep trans
```

- Some tools to monitor network connections and bandwith:
  - 'lsof -i' monitors network connections in real time
  - 'iftop' shows bandwith usage per _connection_
  - 'nethogs' shows the bandwith usage per _process_

- 'python -m SimpleHTTPServer 8080' shares all the files in the current folder over HTTP, port 8080

## screen

```  
screen -a
screen -list
echo $TERM

Ctrl+a c create
Ctrl+a n next
Ctrl+a d detach
Ctrl+a m monitor
Ctrl+a k kill
Ctrl+a h log
Ctrl+a x lock
screen -r
```