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       envsubst - substitutes environment variables in shell format strings


       envsubst [OPTION] [SHELL-FORMAT]


       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.


       Written by Bruno Haible.


       Report bugs to <>.


       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.


       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.