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ENVSUBST

Section: GNU (1)
Updated: December 2014
Index Return to Main Contents
 

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 <bug-gnu-gettext@gnu.org>.  

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
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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