envsubst
substitutes environment variables in shell format strings
Synopsis
envsubst
[OPTION] [SHELL-FORMAT]
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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.
copyright
Copyright © 2003-2007 Free Software Foundation, Inc. License
GPLv3+: GNU GPL version 3 or later
<http://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.
reporting bugs
Report bugs to <bug-gnu-gettext[:at:]gnu[:dot:]org>.
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.
author
Written by
Bruno Haible.