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gettext: envsubst Invocation

 
 15.5.12.5 Invoking the ‘envsubst’ program
 .........................................
 
      envsubst [OPTION] [SHELL-FORMAT]
 
    The ‘envsubst’ program 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.
 
    These substitutions are a subset of the substitutions that a shell
 performs on unquoted and double-quoted strings.  Other kinds of
 substitutions done by a shell, such as ‘${VARIABLE-DEFAULT}’ or
 ‘$(COMMAND-LIST)’ or ‘`COMMAND-LIST`’, are not performed by the
 ‘envsubst’ program, due to security reasons.
 
    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.
 

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