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environ.7: Add some details describing hos shell's environment is initialized
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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@ -138,6 +138,19 @@ or by the
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command if you use
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.BR csh (1).
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The initial environment of the shell is populated in various ways,
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such as definitions from
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.IR /etc/environment
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that are processed by
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.BR pam_env (8)
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for all users at login time (on systems that employ
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.BR pam (8)).
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In addition, various shell initialization scripts, such as the system-wide
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.IR /etc/profile
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script and per-user initializations script may include commands
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that add variables to the shell's environment;
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see the manual page of your preferred shell for details.
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Bourne-style shells support the syntax
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NAME=value command
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