Manual: envsubst

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 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.

AUTHOR
       Written by Bruno Haible.

REPORTING BUGS
       Report bugs in the bug tracker at  or by email to .

COPYRIGHT
       Copyright © 2003-2024 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  prop‐
       erly installed at your site, the command

	      info envsubst

       should give you access to the complete manual.

GNU gettext-runtime 0.23-bisect-1a			  June 2025						 ENVSUBST(1)