On Mar 26 2009, Kevin Darcy wrote:
[...]
The problems with using "ps" to find the named process include:
-- you can get false matches if you don't tailor your string matching
_just_right_,
-- unexpectedly "missed" matches if the command-line arguments change,
even a little bit (e.g. if someone bypasses the wrapper script on an
emergency basis to start the process manually, with the arguments given
perhaps in a different order), and
-- since "ps" operates on a constantly-changing data source, it can
"miss" legitimate processes in the process table. I've seen that happen
many many times with "ps" on Solaris, not sure if Linux or other flavors
of Unix have some sort of concurrency-control mechanism to prevent that
phenomenon.
If you have a pgrep(1) command, use it rather than mucking around with
ps(1). And if you haven't, consider switching to a Unix flavour that
does...
But this is getting off-topic for bind-users.
--
Chris Thompson
Email: c...@cam.ac.uk
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