how to run shall command for every particular interval

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try the 'watch' command.

Usage: watch [-dhntv] [--differences[=cumulative]] [--help] [--interval=<n>] [--no-title] [--version] <command>

so that:

watch -n1  command

will run the command every second, forever

OP has asked for link to OS X version of watch: http://www.macports.org/

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