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When Bash is invoked as an interactive login shell it first reads and executes commands from the file /etc/profile, if that file exists. After reading that file, it looks for /.bash_profile, /.bash_login, and /.profile, in that order, and reads and executes commands from the first one that exists and is readable. When a login shell exits Bash reads and executes commands from the file /.bash_logout, if it exists.
