Flock error - bad number -


im trying create cronjob prevent duplicate cronjobs running:

          • flock -n /mydir/control.txt -c bash /mydir/script.sh

but not working.

when try command in console:

flock -n /mydir/control.txt

i error:

flock: bad number: /mydir/control.txt

i browsing web find answer problems didnt find anything. cause error? how can fix this?

btw use debian 7 64bit


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