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envsubst

substitutes environment variables in shell format strings

- Replace environment variables in stdin and output to stdout:
echo '[$HOME]' | envsubst

- Replace environment variables in an input file and output to stdout:
envsubst < [path/to/input]

- Replace environment variables in an input file and output to a file:
envsubst < [path/to/input] > [path/to/output]

- Replace environment variables in input from a space-separated list:
envsubst [variables] < [path/to/input]

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 <bug-gnu-gettext@gnu.org>.

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.

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.

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