Codex

ENVSUBST

Section: GNU (1)

Updated: October 2014

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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 to <[email protected]>.

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.

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

<DD CLASS="c1|info envsubst:

should give you access to the complete manual.


Index

NAME

SYNOPSIS

DESCRIPTION

Operation mode:

Informative output:

AUTHOR

REPORTING BUGS

COPYRIGHT

SEE ALSO


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