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I'm not well versed in server admin stuff, but I notice the user groups psaserv and psacli psacln come up all the time on different systems. I assume these group names are commonly used for a particular purpose/role. Is that true? Like what?

doub1ejack
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These groups are created by Plesk, a common server administration panel that is generally used on web servers hosting websites.

The psaserv group is used for the server-side management scripts and also for parent-level directories that should not be shared between different websites.

I have not seen a psacli group, but on normal Plesk installations there is the alternative psacln. This group is used for client-side files, such as all of the files held within a website.

newfurniturey
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    I'll point out that apache is a member of both groups. These are a good way to make files accessible to the apache user. – doub1ejack Aug 19 '13 at 13:39