How to get the connected wifi network ssid?

I want to obtain the currently connected wifi networks ssid in a bash script. I am trying to write a backup script where the script will perform a backup to a NAS server if it's connected to my home wifi network. I have looked into the ip route command but it only returns some basic information -

Solution 1:

iwgetid -r

or

iwgetid wlan0 -r

Solution 2:

The following should provide what you are looking for assuming you are connected using 1 wireless device:

nmcli -t -f ssid dev wifi| cut -d\' -f2

Solution 3:

This command returns the SSID of the connected wireless adapter (assuming you only have one).

iwconfig | grep ESSID | sed -e 's/.*ESSID:"\(.*\)".*/\1/'

It also print warning on the terminal but on stderr so it doesn't matter

remi@host~$id:~$ id=$(iwconfig | grep ESSID | sed -e 's/.*ESSID:"\(.*\)".*/\1/')
eth0      no wireless extensions.
lo        no wireless extensions.
virbr0    no wireless extensions.
tap0      no wireless extensions.

remi@host:~$ echo $id
CISPI