ENVSUBST(1)                          GNU                         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

       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 to <>.

COPYRIGHT         top

       Copyright © 2003-2007 Free Software Foundation, Inc.  License GPLv3+:
       GNU GPL version 3 or later <>
       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

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GNU gettext-runtime 2016                      ENVSUBST(1)