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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 refer-
       enced  in SHELL-FORMAT are substituted; otherwise all environment vari-
       ables 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    in    the    bug    tracker    at     <https://savan-
       nah.gnu.org/projects/gettext> or by email to <bug-gettext@gnu.org>.

COPYRIGHT
       Copyright  ©  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 0.21         February 2023                     ENVSUBST(1)

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