# ENVSUBST

NAME
SYNOPSIS
DESCRIPTION
AUTHOR
REPORTING BUGS
COPYRIGHT
SEE ALSO

## 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-FORMAT, one per line.

## AUTHOR

| Written by Bruno Haible.

## REPORTING BUGS

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

## COPYRIGHT

| Copyright © 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.