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This built-in function ensures that each non-system user (whose UID is greater than 100) in
/etc/passwd has a unique home directory.
Each username in
/etc/passwd must have a unique home directory. If users share the same home directory, then one can force the other to execute arbitrary commands by modifying the startup files (
.profile, etc.) or by putting rogue binaries in the home directory itself. In addition, a shared home directory defeats user accountability.
Compliance requirements mandate that each user have a unique home directory.
description: "(arbitrary user comment)"