View difference between Paste ID: 3mu1XT5Y and 58r3agpt

 #!/bin/bash
 
-#
+# http://pastebin.com/58r3agpt
 # 08/06/2013
 # This script attempts to semi-automate the wifi connection process from
 # the command line.
 # It is intended to be used on a headless machine without the
 # requirement of typing several commands for a connection.
 # The script stores previous connection credentials in PLAINTEXT as
 # *.wpa files in the executed directory and in /etc/wpasupplicant.conf.
 # These .wpa files are used to connect to several different ap using
 # previously stored info.
 # Probably a good idea to stop and other network managing software while
 # running this script, also in testing wpa_supplicant does a pretty good
 # job of re-connecting a disassociated link automatically.
 #
 # Mainly created from a combination of scripts taken from theses two
 # sources:
 # http://www.backtrack-linux.org/forums/archive/index.php/t-3367.html
 # AND
 # http://www.linuxquestions.org/questions/linux-general-1/wifi-connect\
 # -script-tested-in-ubuntu-772646/
 #
 # old version1  http://pastebin.com/Pa90HBiU  01/06/2013
 # old version2  http://pastebin.com/FzJnv5Nk  02/06/2013
 #
 # Copy, Distribute and Modify Freely.
 #
 
 
 if [ -z "$1" ]; then
 	printf "Usage: $0 -i [interface] OR AND -f [SAVED_FILE.wpa]\n"
 	exit
 fi
 
 while getopts  "i:f:" opt
 	do
 		case $opt in
 		i ) INT=${OPTARG};;
 		f ) ITEM=${OPTARG};;
 		\?) printf "Usage: $0 -i [interface] OR AND -f [SAVED_FILE.wpa]\n"
 			exit;;
 		* ) printf "Usage: $0 -i [interface] OR AND -f [SAVED_FILE.wpa]\n"
 			exit;;
 		esac
 	done
 
 #
 # check if root
 #
 if [ "$(id -u)" != "0" ]; then
 	printf "This script must be run as root\n" 1>&2
 	exit
 fi
 
 #
 # check if interface is entered as command line argument
 #
 if [ -z "$INT" ]; then
 printf "Usage: $0 -i [interface] OR AND -f [SAVED_FILE.wpa]\n"
 exit
 fi
 
 
 #
 # Search for previous saved config files
 #
 function read_saved (){
 	#
 	# Search or uses for previous wpa configuration files
 	# Checks if command line argument -f [SAVED_FILE.wpa] is greater than zero length and exists
 	# before writing the configiuration to wpa_supplicant.conf.  Otherwise create a new
 	# configuration.
 	#
 	if [ -n "$ITEM" ]; then
 		if [ -s "$ITEM" ]; then
 			printf "File $ITEM exists, proceeding to connect\n"
 			write_conf $ITEM
 		else 	printf "File $ITEM is invalid or does not exist, proceeding to create a new configuration\n"
 			conf_create
 		fi
 	fi
 	#
 	# Save and change IFS so spaces in file names are not interpreted as
 	# separate lines in the array
 	#
 	OLDIFS=$IFS
 	IFS=$'\n'
 
 	#
 	# Read all file names into an array
 	# ref:http://www.cyberciti.biz/tips/handling-filenames-with-spaces\
 	# -in-bash.html
 	#
 	# " -printf '%f\n' " removes path info from outputs
 	#
 	# ref:http://serverfault.com/questions/354403/remove-path-from-find\
 	# -command-output
 	#
 	SAVED_LIST=($(find . -type f -name "*.wpa" -printf '%f\n'))
 
 	#
 	# restore ifs
 	#
 	IFS=$OLDIFS
 
 
 	#
 	# Tests for number of saved wifi connections, if none exit
 	#
 	if [ -z "${SAVED_LIST[0]}" ]; then
 		printf "There are no previous saved wifi connections\n"
 		#
 		# Create new connection
 		#
 		conf_create
 	fi
 
 	#
 	#PS3 Sets the prompt for the select statement below
 	#
 	PS3="Choose a previously saved wifi connection or 's' to skip: "
 
 #
 #Select one of the previous saved configurations to connect with or quit
 #
 select ITEM in "${SAVED_LIST[@]}"; do
 	#
 	# Quit if selected number does not exist or alpha in entered
 	#
 	if [ -z "$ITEM" ] ; then
 			printf "Skipping\n\n"
 			conf_create
 	fi
 	#
 	# Quick check if file is greater than zero length and exists
 	#
 	if [ -s "$ITEM" ]; then
                         printf "File $ITEM exists, proceeding to connect\n"
                         write_conf "$ITEM"
                 else    printf "File $ITEM is invalid or does not exist, proceeding to create a new configuration\n"
 			conf_create
 	fi
 	done
 }
 
 
 function conf_create (){
 	#
 	# Scans for wifi connections & isolates wifi AP name
 	#
 	eval LIST=( $(iwlist $INT scan 2>/dev/null | awk -F":" '/ESSID/{print $2}') )
 
 	#
 	#PS3 Sets the prompt for the select statement below
 	#
 	PS3="Choose wifi connection or 'q' to quit: "
 
 	#
 	# Tests for number of wifi connections, exits if none
 	#
 		if [ -z "${LIST[0]}" ]; then
 			printf "No available wifi connection using $INT\n"
 			exit
 		fi
 
 	#
 	# Select from a LIST of scanned connections
 	#
 	select ITEM in "${LIST[@]}"; do
 
 		#
 		# Quit if selected number does not exist or alpha in entered
 		#
 		if [ -z "$ITEM" ] ; then
 				printf "Exiting\n"
 				exit
 		fi
 
 		#
 		# Get user input for passphrase no need to escape spaces
 		#
 		printf "Enter the passphrase for $ITEM?\n"
 		read "PASSPHRASE"
 
 		#
 		# Append the ITEM variable (ESSID) to .wpa to make a filename
 		# for saved configs
 		#
 		FILENAME=$ITEM".wpa"
 
 		#
 		# Run wpa_passphrase to generate a file for wpa_supplicant to
 		# use, store it locally and in etc/wpa_supplicant.conf
 		#
 		printf "Running wpa_passphrase\n"
 		wpa_passphrase "$ITEM" "$PASSPHRASE" > "$FILENAME" | xargs
 		#
 		# Jump to write_conf function, append configuration filename
 		# to ITEM varibale
 		#
 		ITEM="$FILENAME"
 		write_conf
 	done
 }
 
 function write_conf (){
 	#
 	# Copy local wpa_supplicant file to etc/wpa_supplicant.conf
 	#
 	printf "Writing new configuration file using $ITEM\n"
 	cat "$ITEM">/etc/wpa_supplicant.conf | xargs
 	#
 	# Jump to connect function, pass on the ESSID variable for connection
 	#
 	connect "$ITEM"
 }
 
 function connect (){
 	printf "Connecting using file $*\n"
 
 	#
 	# Capture incoming argument
 	#
 	ESSID=$*
 
 	#
 	# Kill previous instances of wpa_supplicant to stop other instances
 	# wpa_supplicant fighting several different AP's
 	# Kill based on
 	# ref: http://thegeekstuff.com/2011/10/grep-or-and-not-operators
 	# and
 	# http://stackoverflow.com/questions/3510673/find-and-kill-a-\
 	# process-in-one-line-using-bash-and-regex
 	#
 	# Release dhcp ip's and bring down the interface
 	#
 	kill $(ps aux | grep -E '[w]pa_supplicant.*\'$INT'' |  awk '{print $2}') 2>/dev/null | xargs
 	dhclient $INT -r
 	ifconfig $INT down
 
 	#
 	# Assign new credentials to interface
 	#
 	iwconfig $INT mode managed essid "$ESSID"
 	printf "Configured interface $INT; Credential file is $ESSID\n"
 	ifconfig $INT up
 	printf "Interface $INT is up\n"
 	wpa_supplicant -B -Dwext -i$INT -c/etc/wpa_supplicant.conf 2>/dev/null | xargs
 	printf "wpa_supplicant running, sleeping for 15...\n"
 
 	#
 	# Wait to connect before asking for a ip address
 	#
 	sleep 15
 	printf "Running dhclient\n"
 	dhclient $INT
 
 	#
 	# Show current ip for interface
 	#
 	ifconfig $INT | grep inet
 exit
 }
 
 function clean_slate (){
 	#
 	# Optional Clean Slate commands, it is recommended that you perform
 	# a "airmon-ng check kill" to ensure that any other network managers
-	# do not intefere with the connection process
+	# do not interfere with the connection process
 	#
 
 	printf "It is recommended that you perform a \"airmon-ng check kill\" once to ensure that any other network managers do not interfere with the connection process\n\n"
 
 	#
 	# Untested, airmon-ng check kill works better here
 	#
 	#	service network-manager stop 2>/dev/null >/dev/null
 	#	service avahi-daemon stop 2>/dev/null >/dev/null
 	#	sleep 10
 	#	killall wpa_supplicant 2>/dev/null
 	#	ifconfig $INT up
 }
 
 #
 # Start here
 #
 clean_slate
 read_saved
 
 exit