What does the "!" in "${!VARIABLE:-\n}" mean? Post: 303023695

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LEARN ABOUT DEBIAN

printenv

PRINTENV(1)							   User Commands						       PRINTENV(1)

NAME

       printenv - print all or part of environment

SYNOPSIS

       printenv [OPTION]... [VARIABLE]...

DESCRIPTION

       Print the values of the specified environment VARIABLE(s).  If no VARIABLE is specified, print name and value pairs for them all.

       -0, --null
	      end each output line with 0 byte rather than newline

       --help display this help and exit

       --version
	      output version information and exit

       NOTE:  your  shell may have its own version of printenv, which usually supersedes the version described here.  Please refer to your shell's
       documentation for details about the options it supports.

AUTHOR

       Written by David MacKenzie and Richard Mlynarik.

REPORTING BUGS

       Report printenv bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report printenv translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2011 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The full documentation for printenv is maintained as a Texinfo manual.  If the info and printenv programs are properly  installed  at  your
       site, the command

	      info coreutils 'printenv invocation'

       should give you access to the complete manual.

GNU coreutils 8.12.197-032bb					  September 2011						       PRINTENV(1)