ENVSUBST(1)                      User Commands                     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-FORMAT, one per line.

AUTHOR
       Written by Bruno Haible.

REPORTING BUGS
       Report bugs in the bug tracker at
       <https://savannah.gnu.org/projects/gettext> or by email to
       <bug-gettext@gnu.org>.

COPYRIGHT
       Copyright (C) 2003-2020 Free Software Foundation, Inc.  License GPLv3+:
       GNU GPL version 3 or later <https://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 20200704       July 2020                       ENVSUBST(1)