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envsubst(1) [centos man page]

ENVSUBST(1)								GNU							       ENVSUBST(1)

NAME
envsubst - substitutes environment variables in shell format strings SYNOPSIS
envsubst [OPTION] [SHELL-FORMAT] DESCRIPTION
Substitutes the values of environment variables. Operation mode: -v, --variables output the variables occurring in SHELL-FORMAT Informative output: -h, --help display this help and exit -V, --version output version information and exit In normal operation mode, standard input is copied to standard output, with references to environment variables of the form $VARIABLE or ${VARIABLE} being replaced with the corresponding values. If a SHELL-FORMAT is given, only those environment variables that are referenced in SHELL-FORMAT are substituted; otherwise all environment variables references occurring in standard input are substituted. When --variables is used, standard input is ignored, and the output consists of the environment variables that are referenced in SHELL-FOR- MAT, one per line. AUTHOR
Written by Bruno Haible. REPORTING BUGS
Report bugs to <bug-gnu-gettext@gnu.org>. COPYRIGHT
Copyright (C) 2003-2007 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 envsubst is maintained as a Texinfo manual. If the info and envsubst programs are properly installed at your site, the command info envsubst should give you access to the complete manual. GNU gettext-runtime 0.18.2 March 2013 ENVSUBST(1)

Check Out this Related Man Page

PRINTENV(1)							   User Commands						       PRINTENV(1)

NAME
printenv - print all or part of environment SYNOPSIS
printenv [VARIABLE]... printenv OPTION DESCRIPTION
Print the values of the specified environment VARIABLE(s). If no VARIABLE is specified, print name and value pairs for them all. --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/> COPYRIGHT
Copyright (C) 2009 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 7.1 July 2010 PRINTENV(1)
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