ping6 ff02::1%eth0

When to choose which syntax to install your own Python package

Default-Variable

Auf den beiden großartigen englischsprachigen Seiten zur Bash-Prgorammierung tldp und cyberciti kann man jede Menge Tricks zur Variablenmanipulation in bash finden.

Ein sehr häufiger Fall ist die Default-Variable. Dabei gibt es zwei verschieden Fälle. Der mit dem Gleichheitszeichen (=), mit integrierter Zuweisung des Wertes

echo ${varname:="default value"}

Hier hat …

Tricks with ls

List files except those with a specific extension (zsh)

To list all files in the current directory except those with special extensions often is very useful. For example if I am in a directory with many plots or many data files and only a few others in …

Mount a folder remotely

I like sshfs the secure shell filesystem. But sometimes I forget how the unmounting command is, so I write this short note to myself.

The mounting part is intuitive:

sshfs HOST:PATH mountpoint

It mounts the given path from the given host to the given mountpoint …

X11 forwarding combined with sudo

Unfornunately I have no better solution found for X-forwarding and sudoing afterwards, yet.

This solution is insecure, but works as a dirty hack.

user:~$ xauth list | grep unix$(echo $DISPLAY | cut -c10-12) > /tmp/xauth
user:~$ sudo -s
root:~# xauth add $(cat /tmp/xauth)
root …

If one wants to calculate in vim one simply has to write the following line:

2 pi mult

and visually select it with V then pass it to rpnl or calc or bc or so via xargs

:!xargs rpnl

to get the result in the line.

This trick also works …

Ctrl+[; Space; Enter; Ctrl+]

curly braces