2

I need to monitor if, for example, file /tmp/somefile123 was created after some events. I tried to use inotifywait but here is a problem:

# inotifywait -q -e create /tmp/somefile?*
Couldn't watch /tmp/somefile?*: No such file or directory

because there is exactly no such file, I want to know if it will be there!

How can I resolve this issue?

UPD: Maybe if I explain what I want to reach it will be more clear.

I need to write shell script (sh) with minimal CPU consumption, something like this:

if [ $(inotifywait -e create $SPECIFIC_FILE) ]; then
    blah-blah-blah some actions
fi
# And then similarly monitor if this file was deleted and then do another actions

I expect that script will stop execution on inotifywait -e create $SPECIFIC_FILE till this $SPECIFIC_FILE will not created and it would be better then

while [ ! -f $SPECIFIC_FILE ]; do
    blah-blah-blah some actions
    sleep 1
done
6

By having inotifywait check on the parent directory:

/tmp$ inotifywait -e create -d -o /home/me/zz /tmp
/tmp$ touch z1
/tmp$ cat ~/zz
/tmp/ CREATE z1

You can also specify the time format for the event with the -timefmt option. Also, if you want to act immediately by executing some script file, for instance, you may use tail -f in the script file to monitor continuously the log file, here /home/me/zz, or you can create a named pipe file and have inotifywait write to it, while your script reads from it.

  • Maybe I didn't write clearly enough what I want to reach. I edited my question – HeroFromEarth Apr 18 '17 at 6:17
  • 2
    @HeroFromEarth I am sorry, but my answer above fits exactly what you stated in your OP and your update. Why do you believe it does not? – MariusMatutiae Apr 18 '17 at 6:38
  • I misunderstood your answer at first, sorry. Is making log file and reading it with tailf | grep 'pattern' will do less CPU consumption then while loop? – HeroFromEarth Apr 18 '17 at 9:28
  • Mark your answer as accepted because this is right, but question about "what better" still open :) – HeroFromEarth Apr 18 '17 at 9:44

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