script that will monitor changes in at least 2 files/directories and execute a third script only when both are modified - linux

Question

I have two sensors that each create an entry in a text file when triggered. Now I need something to monitor these two files (i can also put them in 2 directories each if that helps in any way) and trigger a third script only when changes occur to both of the aforementioned files/directories. I need real-time (or near to it) between events and notification. I have found tools like inotify-wait, fswatch, entr and some others but all of these are triggered at any change.
At the moment I'm trying this but it does not work properly:
#!/bin/bash
while inotifywait -e modify /home/user/triggerdir/ ;
do
if [ "inotifywait -e modify /home/user/triggerdir2/" ];
then
echo Alert | mail -n -s "test-notify SCRIPT HUZAAAA" user#gmail.com
else
# Don't do anything unless we've found one of those
:
fi
done
I have looked for similar issues/solutions on the web, the closest would be this but it has no working answer.

Answer 1

Since you're having trouble with that, you might consider a simplistic approach.
Rather than a loop, I'd put your script in the crontab. Run it every day, every hour, every minute, whatever you need. If you need more often, you could loop, but make sure you at least sleep a second to be nice to the CPU.
If a minute or more between event and notification is ok this should be all you need:
#!/bin/bash
key=/some/safe/path/.hidden_filename
[[ -e "$key" ]] || touch "$key" # make sure it exists
if [[ file1 -nt "$key" && file2 -nt "$key" ]]; then
mail -n -s "test-notify SCRIPT HUZAAAA" user#gmail.com <<< "Alert!"
touch "$key"
fi

Answer 2

I have hacked something together which does work as I need it to though is terrible coding (probably shouldn't be called that)
3 scripts involved:
script 1:
#!/bin/bash
count=0
while :
do
{ inotifywait -e modify /home/user/triggerdir/ && let count="$count + 1"; } || exit 1
if [ "$count" -eq "2" ]; then
echo Alert | mail -n -s "Huzzah" user#gmail.com
/home/user/trigger2.sh &&
killall trigger.sh inotifywait
fi
done
script 2:
#!/bin/bash
count=0
while :
do
{ inotifywait -e modify /home/user/triggerdir/ && let count="$count + 1"; } || exit 1
if [ "$count" -eq "2" ]; then
echo Alert | mail -n -s "Huzzah" user#gmail.com
/home/user/trigger.sh &&
killall trigger2.sh #Do something.
# count=-250
fi
done
as the two scripts spawn bash/inotify processes I run once in 24 hours a cronjob two kill those using this script 3:
#!/bin/bash
killall trigger2.sh trigger.sh inotifywait bash
any help to improve is welcome, thanks :)