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envsubst - substitutes environment variables in shell format strings




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 SHELLFORMAT 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.

Reporting Bugs

Report bugs to <>.


Copyright (C) 2003-2005 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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.

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