envsubst - Unix, Linux Command

NAME

envsubst - substitutes environment variables in shell format strings

SYNOPSIS

envsubst [OPTION] [SHELL-FORMAT]

DESCRIPTION

Substitutes the values of environment variables.

Operation mode:

Tag	Description
-v, --variables
	output the variables occurring in SHELL-FORMAT

Informative output:

Tag	Description
-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-FORMAT, one per line.

AUTHOR

Written by Bruno Haible.

REPORTING BUGS

Report bugs to <bug-gnu-gettext@gnu.org>.

COPYRIGHT

Copyright © 2003-2005 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.