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Alex Rivera
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There are several ways to do this, but I'm not sure which one of them is the best. Here's what I can think of: Look for the process using pgrep. Have the script lock itself using flock, and then check if it is locked each time it runs. Create a pid file in /var/run/program_name.pid and check for existence, and compare pids if needed. There are probably more ways to do this. What do you think is the best approach?
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