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check that script is not running twice

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# 1  
Old 02-20-2002
check that script is not running twice
using ps -ef | fgrep "ld_data"

how do i write a script to check that it didn't already run

Thanks
# 2  
Old 02-20-2002
Easiest way is:

ps -ef | grep "[l]d_data" || ld_data


That will run the program "ld_data" if and only if it is not found already running. Placing the first character within square brackets protects the "grep" command line from being found and triggering a false positive.
# 3  
Old 02-20-2002
Quote:
Originally posted by PxT
Easiest way is:

ps -ef | grep "[l]d_data" || ld_data


That will run the program "ld_data" if and only if it is not found already running. Placing the first character within square brackets protects the "grep" command line from being found and triggering a false positive.

Thank you
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