1. NAME

envsubst - substitutes environment variables in shell format strings

2. SYNOPSIS

envsubst [OPTION] [SHELL-FORMAT]

3. DESCRIPTION

Substitutes the values of environment variables.

3.1. Operation mode:

  • -v, --variables
        output the variables occurring in SHELL-FORMAT

3.2. 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.

4. AUTHOR

Written by Bruno Haible.

5. REPORTING BUGS

Report bugs to < >.

6. 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.

7. 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.