Run CLI with single instance

I use crontab on linux to run action of codeigniter for, run one minute one time, but sometime this action run take over one minute, so i want at a moment this action running single. How can i do that? Please help me.

P/s : i want use shell linux to check it.

I'm sorry, I don't understand exactly what you are asking.

I understand that you have a cron job that sometimes takes over a minute to run. You seem to be wanting to do something if it does take longer than a minute to run but I don't understand what you mean by "this action running single". Could you explain more?

Hi CroNIX,

I mean, in the same time, there is only one instance of this action is run

I found something:

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