Screencasting on Gnu/Linux

install-dependencies.sh

sudo add-apt-repository ppa:fossfreedom/byzanz
sudo apt-get update && sudo apt-get install byzanz

#
# If you are behind a firewall
#

#!/bin/bash

sudo apt-get update 2> /tmp/keymissing; 

for key in 
    $(grep "NO_PUBKEY" /tmp/keymissing |sed "s/.*NO_PUBKEY //"); 

do echo -e "nProcessing key: $key"; 
    sudo gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv $key && 
    sudo gpg --export --armor $key | 
    sudo apt-key add -; 
done

screenr.sh

#!/bin/bash

# ------------------------------------
# How to use
# ./screenr.sh DURATION -c OUTPUT.gif
#
# Adapted by @franklinjavier
#
# font: http://askubuntu.com/a/201018 
# ------------------------------------

# Delay before starting
DELAY=2

# Duration and output file
if [ $# -gt 0 ]; then
    D="--duration=$@"
else
    echo Default recording duration 10s to /tmp/recorded.gif
    D="--duration=10 /tmp/recorded.gif"
fi

XWININFO=$(xwininfo)

read X < <(awk -F: '/Absolute upper-left X/{print $2}' <<< "$XWININFO")
read Y < <(awk -F: '/Absolute upper-left Y/{print $2}' <<< "$XWININFO")
read W < <(awk -F: '/Width/{print $2}' <<< "$XWININFO")
read H < <(awk -F: '/Height/{print $2}' <<< "$XWININFO")

echo Delaying $DELAY seconds. After that, byzanz will start
for (( i=$DELAY; i>0; --i )) ; do
    echo $i
    sleep 1
done

byzanz-record --verbose --delay=0 --x=$X --y=$Y --width=$W --height=$H $D