I'm trying to grab lines from grep and sorting them into another command, the command I'm using for grepping atm is as follows (hasn't yet been chopped enough for what I will be using it, but this gives better context):
iwlist wlan0 scanning | grep -oE '(ESSID:|Quality=|Encryption Key:).*'
Output looks like this (but will change depending on my computer's location):
Quality=64/70 Signal Level=-49dBm Encryption key:on ESSID:"Hringdu_20558" Quality=61/70 Signal Level=-48 dBm Encryption key:on ESSID:"SiminnEBE932" Quality=30/70 Signal Level=-71 dBm Encryption key:on ESSID:"Siminn106C46 Quality=28/70 Signal Level=-83 dBm Encryption key:on ESSID:"SiminnECC63F"
I want to use these lines individually for executing another command
$ssid=$(zenity --list --text "Available Networks" --list --column "ESSID" --column "Secure" --column "Signal" "$ESSID" "$ENC" "$Signal");
These are the begginings of a quickie wireless network selection prompt. $ESSID/$ENC/$Signal would be based on the output from the earlier grep, so what I need to do essentially after working the grep output a bit more to look something like this in the end after chopping it with cut/awk/sed:
91% on Hringdu_20558
(note: I get the percentage by multiplying 64 by 10 then dividing by 7; 64*10/7)
Is to apply these lines recursively for every detected ESSID into the zenity command via scripting. And to add to problems; as you may notice the grep output is in reverse order from the zenity command, so this means "Hringdu_20558" would have to go in first, and "87%" would have to go in last.
In other words in this specific scenario I need to somehow grab the third line from the grep output, and append it to the other command, then work up the previous 2 lines, and repeat this going for the third line after the line I started until there are no more lines.
In essence the final zenity command should end up looking something like this based on the above outputs:
$ssid=$(zenity --list --text "Available Networks" --list --column "ESSID" --column "Secure" --column "Signal" "Hringdu_20558" "on" "91%" "SiminnEBE932" "on" "87%" "Siminn106C46" "on" "43%" "SiminnECC63F" "on" "40%");
How can I do this? Can it be done with just basic shell scripting?