envsubst <root
ENVSUBST(1)                                    GNU                                    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  corre‐
       sponding  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 envi‐
       ronment variables that are referenced in SHELL-FORMAT, one per line.

AUTHOR
       Written by Bruno Haible.

REPORTING BUGS
       Report bugs to .

COPYRIGHT
       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
       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 0.19.7                December 2015                               ENVSUBST(1)

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