Continuously monitor a systemd service

gistfile1.txt

#!/bin/bash                                                                                                                                 

cd /root/.maint

# Remove any pre-existing pipe if one exists
if [[ -e jcpipe ]]; then
    rm -f jcpipe
fi
mkfifo jcpipe

# Use this command to feed the pipe with data continuously
/usr/bin/journalctl -x -b -f -u hostapd >jcpipe &

# Now read lines from the pipe forever; if we find the error message, take action.
while read line; do

    if [[ "$line" =~ "Could not add STA to kernel driver" ]]; then
    
        # wait 3s then restart
        sleep 3   
        /usr/bin/systemctl restart hostapd        
    fi
done < jcpipe