Some time ago I wrote about how to make a screencast from shell, but I had mentioned the possibility to do so by recording simultaneously from a microphone, and therefore very useful for those who want to make guides. The idea was given to me by a reader, whom I thank, and I just wondered if there was a single command for an audio-video screencast. I must say that I found it difficult to find an optimal solution, since using mainly Debian testing and Sid, that happens sometimes (often) what you have experienced the day before and was working the next day gives you trouble or not working. However this time I also experienced all that I installed Ubuntu 9.10 last night, just because I wanted to get rid of curiosity, indeed my last attendance dates back to the Ubuntu version 8.4. Here are the commands that I have met:

Using ffmpeg with oss:

ffmpeg -s 1280x1024 -r 25 -f x11grab -i :0.0 -f oss -i /dev/dsp screen.avi

Using ffmpeg with arecord:

arecord -D default -t raw -c 1 -f S16_LE -r 48000 - | ffmpeg -f s16le -ab 128k -ar 48000 -ac 1 -i --acodec mp2 -f x11grab -r 2 -s 1280x1024 -i :0.0 -vcodec mpeg4 screen.avi

Remember to set in: preferences-audio-input connector on your microphone. For more information and options see here and here as well as to man.

NetFleet is a cross-platform download manager written in C + + relying on the Trolltech Qt library. With very intuitive interface and licensed under GPL v3, download speeds by using multiple connections for each file. To prove:

wget http://netfleet.googlecode.com/files/netfleet_0.2.1-linux-bin.tar.bz2

netfleet_0.2.1 tar-xjf linux-bin.tar.bz2

cd netfleet_0.2.1-linux-bin

. / netfleet.sh

Not bad. For more info refer to the site of the project.

To know what are the programs that take up much space in our system, there is a command, a little longish for the truth, but that helps us to understand who are the monsters that take up so much space. I have one, and is called imageshack-uploader, which ever is the ground because I feel very comfortable.

56,078 MB linux-source-2.6.30
58,781 MB inkscape
64,422 MB evolution-common
66,570 MB linux-image-2.6.30-1-686
66,574 MB linux-image-2.6.30-2-686
82,582 MB sun-java6-bin
83,547 MB virtualbox-3.0
86,574 MB foomatic-db-gutenprint
106,246 MB openoffice.org-core
570,491 MB imageshack-uploader

The command is as follows:

dpkg-query --show --showformat='${Package;-50}\t${Installed-Size}\n' | sort -k 2 -n | grep -v deinstall | awk '{printf "%.3f MB \t %s\n", $2/(1024), $1}' | tail -n 10

To change the number of programs to display, change the number next to tail-n.

Those who know me know that I am a set of privacy and security, so much so that my debianbox always use some of the ways to protect my freedom. But sometimes it happens that you underestimate some things and one of these cookies are the adobe flash player, so much so that we feel safe once used the tools that give us our browser for the removal of navigation information. Well it is not, and I invite anyone who reads this post to go and check the following locations:

~ / .macromedia / Flash_Player / # SharedObjects / xxxx /
~ / .macromedia / Flash_Player / macromedia.com / support / flashplayer / sys

There are folders and the names of the sites we visited, and this I do not like, so I gave the command:

$ Rm-r. Macromedia

and then I went into page setup from Adobe and I set it so that it no longer surprises.

Inxi is a tool that I met recently and I immediately appreciated for its simplicity and the directness with which information displayed on screen of your system, thanks to the two colors, blue and red. To install I used:

# Cd / usr / local / bin & & wget-Nc smxi.org / inxi & & chmod + x inxi

or use the repository for Debian based versions of cathbards:

on
wget-O / etc / apt / sources.list.d / cathbard.list http://cathbard.com/files/cathbard.list
apt-get update & & apt-get install Cathbard-keyring inxi

For users of Arch:

cd / usr / bin & & wget-Nc smxi.org / inxi & & chmod + x inxi

Visualization tasks point just run as shown with the command:

inxi-F

for those who want the color red just combine the-c6:

inxi-F-C6

These other commands:

Read the rest of this entry »

This post was created as a supplement to my guides that are made earlier here and here, to give more color to the shell, but arises mainly from a request made to me by a reader, I asked: "How did I change only the color cursor and use the green for the normal user and red for root "I replied immediately by saying that you can change the cursor and you can test everything with these commands:

echo -ne "\033]12;Green\007"
echo -ne "\033]12;Red\007"
echo -ne "\033]12;Blue\007"
echo -ne "\033]12;Yellow\007"

Then choose the color of the cursor replace the string present in PS1. Bashrc with the string bass is good for Debian based, no need to insert another fere only the entry for color

PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '"\033]12;Green\007"

Then save it all in. bashrc for the normal user or / root / .bashrc for the root user.

For those who want a situation like that in figure or a base from where to start can use this:

PS1='\[\e[1;42m\d\\\t\\\]\u\H\[\e[0;40m\]:\w\$'"\033]12;Green\007"

The string above is very ugly and I'm surprised that it works well certainly you can sort and simplify, but I have no desire

per quello di root , in più l'orario e la data. Today I got the idea to give a little more color in my terminal and then I started to work to make some changes and add a guide in the past, the color green for the 'regular user and red for what root, plus the time and date. Without going into too much detail we go to see this kind of customization. Let's start by saying that what we are going to change is the environment variable "PS1", so for data that are inside, just for a:

echo $PS1

which in my case it returns this:

\[\e]0;\u@\h: \w\a\]\[\e[1;42m\d\\\t\\\]\u\H\[\e[0;40m\]:\w\$

In the terminal entering the Stinga below, will appear once the new changes that everyone can further edit it to your liking, and eventually save them. Bashrc to take effect for the normal user, or in / root / .bashrc to root account. This string will clearly sosituire the default which is located near the beginning of. bashrc.

Normal user color:

PS1='\[\e[1;42m\d\\\t\\\]\u\H\[\e[0;40m\]:\w\$'

Root red:

PS1='\[\e[1;41m\d\\\t\\\]\u\H\[\e[0;40m\]:\w\$'

Explanation of the string:

\[ the start of a sequence of non-printing characters, which can be used to include a sequence in the prompt control of the terminal.

\e       un carattere ASCII di escape (033)

1;42     formattazione in grassetto colore di sfondo verde intensità normale

m       fine di una sequenza ANSI

\d la data nel formato "Giorno-della-settimana Mese Giorno"

\\       un backslash

\t       l'ora corrente nel formato HH:MM:SS 24 ore

\u       il nome-utente dell'utente corrente

\H       il nome dell'host

0;40     formattazione normale colore di sfondo nero intensità normale

\]       marca la fine di una sequenza di caratteri non stampabili

\w       la directory di lavoro corrente con HOME abbreviato con una tilde

Lista dei colori: Leggi il resto di questo articolo »

To generate a password, in addition to the command above, there are 4 other commands, or at least I know only these, however, all from the command line.

egrep-ioam1 '[a-z0-9] (8)' / dev / urandom

openssl rand-base64 9

makepasswd --chars=20

</ Dev / urandom tr-dc A-Za-z0-9_ | head-c10 | xargs | cat