You can use watch -x or –exec option to pass command to exec(2) instead of sh -c which reduces the need to use extra quoting to get the desired effect.
Example:
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## create a function and export myfun() { echo 'hello world'; } export -f myfun ## watch -x or --exec options myfun ## returns hello world watch myfun ## returns hello world watch --exec myfun ## returns error watch --exec bash -c "myfun" ## returns hello world pkill -f "myscript.sh" ## kill myscript.sh rm my* |