Bash Script, Variable reference trouble

[Italian Prince]

i wrote 3 scripts though all need to have the same variables. which the variables may change and i rather change one file than 3. I cannot find out how or if it is possible to have one txt file or bash file just containing the variables and all three scripts will refer to the variables inside that one file.

Also, since it is 3 scripts, all are for terminal bassed programs. Is there a way to make a script to run all at the same time but one in each terminal. for example, running script.sh will open a terminal and run script1.sh and open another terminal and run script2.sh as well as another terminal for script3.sh at the same time.

This is the scripts.

#!/bin/bash

USERNAME=""
CHANNEL=""
BSSID="xx:xx:xx:xx:xx:xx"
ESSID=""

if [ "$ESSID" = "" ]; then
  airmon-ng stop ath0
  airmon-ng start wifi0
  airodump-ng ath0
else
  airmon-ng stop ath0
  airmon-ng start wifi0
  mkdir /home/$USERNAME/Desktop/aircrack
  cd /home/$USERNAME/Desktop/aircrack
  airodump-ng -c $CHANNEL -w $ESSID --bssid $BSSID ath0
fi

#!/bin/bash

USERNAME=""
CHANNEL=""
BSSID="xx:xx:xx:xx:xx:xx"
ESSID=""
MYMAC="xx:xx:xx:xx:xx:xx"

cd /home/$USERNAME/Desktop/aircrack
aireplay-ng -1 0 -e $ESSID -a $BSSID -h $MYMAC ath0
aireplay-ng -3 -e $ESSID -b $BSSID -h $MYMAC ath0

PS this is all experimental. I am using this on my own network to test my script out. I am not that familiar with linux or writing scripts. i read a few tutorials and this was a way i'd like to try out what i learned.

[secondmouse]

Have all the variables defined in a file named, say, vars

In the script that needs access to the variables, put this line
. ./vars
right after #!/bin/bash.

[Italian Prince]

Thank you secondmouse,

However i was still unable to make this work. i made sure all the scripts were in the same dir as the variable file i named my variable file "variables" and i wrote the beginning of each script as

#!/bin/bash
../variables

if [ "$ESSID" = "" ]; then
  airmon-ng stop ath0
  airmon-ng start wifi0
  airodump-ng ath0
else
  airmon-ng stop ath0
  airmon-ng start wifi0
  mkdir /home/$USERNAME/Desktop/aircrack
  cd /home/$USERNAME/Desktop/aircrack
  airodump-ng -c $CHANNEL -w $ESSID --bssid $BSSID ath0
fi

but it still didn't work. am i supposed to make the variables file a script or name it with a certain extenstion? because this is all i put in that file

USERNAME="myusername"
CHANNEL="thechannel"
BSSID="xxxxxxxxxx"
ESSID="name"
MYMAC="xxxxxxxxxx"

Thank you in advance

[secondmouse]

Italian Prince, you gotta put a space between the two dots like this
. ./variables
the first . is equivalent to command source, that is, you can also use it like
source ./variables

[Italian Prince]

secondmouse,

Yes i didn't notice the space between the dots when you wrote it before. This did work and it worked great! You have helped solve my problem. Though i feel like im asking to much. Would you happen to know how to make a script open those two scripts but opening different terminals to run at the same time? i could imagin how to make it just open a terminal but now how to make the scripts run in the newly opened terminals

[secondmouse]

Italian Prince, if you are using gnome, try this
gnome-terminal -x /path/to/script1
gnome-terminal -x /path/to/script2

This works great if script1 and script2 doesn't exit when running, for example
gnome-terminal -x top
If you need to see the running status of the script, you can add a sleep N to the end of the script. For example:
script1
#!/bin/bash
echo "script 1 running"
sleep 10

in the terminal, execute
gnome-terminal -x ./script1

But if you just need to run script1 and script2 in turn, you can always do that in the same terminal by
./script1 &
./script2