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envsubst - substitutes environment variables in shell format strings
envsubst [OPTION] [SHELL-FORMAT]
Substitutes the values
of environment variables.
- -v, --variables
- output the variables
occurring in SHELL-FORMAT
- -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 © 2003-2005 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.
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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