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NAME | SYNOPSIS | DESCRIPTION | AUTHOR | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON |
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ENVSUBST(1) User Commands ENVSUBST(1)
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 in the bug tracker at
<https://savannah.gnu.org/projects/gettext> or by email to
<[email protected]>.
Copyright © 2003-2025 Free Software Foundation, Inc. License
GPLv3+: GNU GPL version 3 or later
<https://gnu.org/licenses/gpl.html>
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.
This page is part of the gettext (message translation) project.
Information about the project can be found at
⟨http://www.gnu.org/software/gettext/⟩. If you have a bug report
for this manual page, see
⟨http://savannah.gnu.org/projects/gettext/⟩. This page was
obtained from the tarball gettext-0.26.tar.gz fetched from
⟨https://ftp.gnu.org/gnu/gettext/⟩ on 2025-08-11. If you discover
any rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a
mail to [email protected]
GNU gettext-runtime 0.26 July 2025 ENVSUBST(1)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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