Selecting and killing a process in htop can be difficult because the order of the processes constantly shift. Press `F` to  let the cursor follow the currently selected process.

----
To make an alias with fish shell create a new function. Avoid recursion by using the `command` command:

    function ls
        command ls -l
    end

----
Kill multiple processes with htop:

* Press `F4` and filter for the processes
* For each process press `Space` to mark it
* Press `F9` and select a signal to kill all marked processes

----
Just learned about pkill. pkill allows to send signals to processes by specifiying the process name:

```
pkill -9 firefox
```

Here I am feeling dump that I used things like this for the last couple of years:

```
 ps ax | grep firefox | awk '{print $2}' | xargs kill -9
```

----
JSON hard to read? Try beautifying it with: 

```
python -m json.tool multiproject.json
```

Note: This also seems to validate the JSON.

----
Just a quick one because I need this all the time but I keep forgetting it: How
 to append the current date to a filename.

```
touch abcd_`date +%F`
ls abcd*
> abcd_2015-09-17
```

or if you are using fish:

```
touch abcd_(date +%F)
```



----
Mysql
=====

```
 select * from token\G
```

instead of

```
 select * from token;
```

will display the the columns as rows below each record. This can avoid line breaks in the output and make it easier to read.

----
SSL
===

Get information about a SSL certificate:

```
openssl x509 -in test.crt -text -noout
```

----
How to copy a vagrant image to another machine
========================================

Copy the ssh key from `~/.vagrant.d/insecure_private_key` and append it to the same file on the other machine to be able to log into the machine later. 

Next:

```
vagrant package --base vm-name --output /path/to/mybox.box
```

Copy file to other machine. Then do:

```
vagrant init vm-name /path/to/mybox.box
vagrant up
```


Source: http://stackoverflow.com/questions/19094024/is-there-any-way-to-clone-a-vagrant-box-that-is-already-installed

----
To copy files to the home directory using scp you can use the shortcut `./`

```
scp file.zip  user1@123.123.123.123:./
```

----
Multiple architectures on Ubuntu
===========================

List current *main* architecture:

```
> dpkg --print-architecture
amd64
```

List other architectures that are allowed on this system:

```
> dpkg --print-foreign-architectures
i386
```

Modify non-main architectures:

```
sudo dpkg --add-architecture test
sudo dpkg --remove-architecture test
```

Specifying the architecture when installing packages:

```
sudo apt-get install libsdl-image1.2:i386
```

Foreign architectures will be installed in separate directories. E.g.: `/usr/lib/i386-linux-gnu/`.

Show all packages with a foreign architecture:

```
dpkg -l | grep :i386
```

More info: https://wiki.debian.org/Multiarch/HOWTO

----
Cool tip: When typing in a command in a urxvt you can press shift + mouse click anywhere on the current line to move the cursor.

Very useful when fixing a typo in a long command.