Easy QR CIA installer shell script

icia.sh

#!/bin/bash

# Requirements:
#  * qrencode <https://fukuchi.org/works/qrencode/> (apt-get install qrencode)
#  * netcat <http://nc110.sourceforge.net/>

if [ -z "$1" ]; then
	echo "Usage: $0 filename" >&2
	exit 2
fi

if [ ! -e "$1" ]; then
	echo "$1: file not found" >&2
	exit 1
fi

echo "Scan the following QR code using FBI:"
echo
qrencode -tutf8 "http://`hostname`:12345/"

{
	echo -ne "HTTP/1.1 200 OK\r\nContent-Length: `stat -c%s $1`\r\n\r\n"
	cat $1
} | nc -l 12345 >/dev/null