envsubst(1) — Linux manual page

ENVSUBST(1)                   User Commands                  ENVSUBST(1)

NAME         top

       envsubst - substitutes environment variables in shell format
       strings

SYNOPSIS         top

       envsubst [OPTION] [SHELL-FORMAT]

DESCRIPTION         top

       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         top

       Written by Bruno Haible.

REPORTING BUGS         top

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

COPYRIGHT         top

       Copyright © 2003-2023 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         top

       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.

COLOPHON         top

       This page is part of the gettext (message translation) project.
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       for this manual page, see
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GNU gettext-runtime 0.22.5    February 2024                  ENVSUBST(1)

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