Save wrong line bash

A simple thing to do when you realize you just typed the wrong line is hit Ctrl+C; if you want to keep the line, but need to execute something else first, begin a new line with a back slash - \, then Ctrl+C. The line will remain in your history.

Latex Dashes

Hyphen: daughter-in-law, X-rated\\
En dash: pages 13--67\\
Em dash: yes---or no? \\
Minus sign: $0$, $1$ and $-1$

Bash trim filename

However, buried in there is a section on Parameter Substitution which tells us that $foo is really a shorthand for ${foo} which is really the simplest case of several ${foo:operators} and similar constructs.

Given:
foo=/tmp/my.dir/filename.tar.gz

We can use these expressions:

path = ${foo%/*}

To get: /tmp/my.dir (like dirname)

file = ${foo##*/}

To get: filename.tar.gz (like basename)

base = ${file%%.*}

To get: filename

ext = ${file#*.}

To get: tar.gz



${variable%pattern}
Trim the shortest match from the end
${variable##pattern}
Trim the longest match from the beginning
${variable%%pattern}
Trim the longest match from the end
${variable#pattern}
Trim the shortest match from the beginning

Beep frequency

xset b vol freq dur

volume: % of max
freq: Hz
dur: ms

Reverse Tunelling and x2x

To control a box behind a firewall using keyboard and mouse on another computer.

On firewalled computer run

ssh -R 22222:localhost:22 user@localcomp

On local computer run
ssh -p -X 22222 user@localhost
In the last ssh tunnel run

x2x -east -to :0

Gvim invisible cursor after vsplit

Vim code:

let &guifont=&guifont

From:
http://old.nabble.com/Cursor-become-invisible.-td20630223.html

Ubuntu wireless driver eee 901 rt2860

You will need dkms for your kernel if you haven't got it.

Get rid of old driver:

cd /lib/modules/`uname -r`/kernel/drivers/staging/rt2860

sudo mv rt2860sta.ko rt2860.bak

Download new driver:

http://www.array.org/ubuntu/dists/intrepid/eeepc/binary-i386/rt2860-dkms_1.7.1.1_all.deb

then sudo dpkg -i rt2860-dkms_1.7.1.1_all.deb

sudo init 6

WPA1/2 should work now.