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Full Discussion: When/how is $HOSTNAME populated ?
Operating Systems AIX When/how is $HOSTNAME populated ? Post 302331649 by Gee-Money on Monday 6th of July 2009 09:40:11 PM
Old 07-06-2009
Any variable in the shell comes into existence by your shell's startup scripts...

I would start there. Not sure about ksh, but in bash it would be /etc/bashrc....start there, and that file should lead you to other files that might get "sourced" (processed) within that file. Then there is your local user shell startup file....for instance, "~/.bashrc"

If you know the files, you could "grep -n HOSTNAME" on those files, to show the line numbers where the string HOSTNAME occurs.
 

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LEARN ABOUT DEBIAN

hostname

HOSTNAME(5)							   /etc/hostname						       HOSTNAME(5)

NAME

       hostname - Local host name configuration file

SYNOPSIS

       /etc/hostname

DESCRIPTION

       The /etc/hostname file configures the name of the local system that is set during boot, with the sethostname(2) system call. It should
       contain a single newline-terminated host name string. The host name may be a free-form string up to 64 characters in length, however it is
       recommended that it consists only of 7bit ASCII lower-case characters and no spaces or dots, and limits itself to the format allowed for
       DNS domain name labels, even though this is not a strict requirement.

       Depending on the operating system other configuration files might be checked for configuration of the host name as well, however only as
       fallback.

HISTORY

       The simple configuration file format of /etc/hostname originates from Debian GNU/Linux.

SEE ALSO

       systemd(1), sethostname(2), hostname(1), hostname(7), machine-id(5), machine-info(5)

AUTHOR

       Lennart Poettering <lennart@poettering.net>
	   Developer

systemd 							    10/07/2013							       HOSTNAME(5)
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