gif command for recording animated gifs in Linux

gif.sh

#!/bin/bash

# USAGE: gif SECONDS FILENAME
# example: gif 4 out.gif
# then drag a box :D

# Delay before starting
DELAY=0

# Duration and output file
if [ $# -gt 0 ]; then
    D="--duration=$@"
else
    FILE="/tmp/$(date +%s).gif"
    echo Default recording duration ${DELAY}s to $FILE
    D="--duration=10 $FILE"
fi

# xrectsel from https://github.com/lolilolicon/xrectsel
ARGUMENTS=$(xrectsel "--x=%x --y=%y --width=%w --height=%h") || exit -1

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

byzanz-record -c --verbose --delay=0 ${ARGUMENTS} $D