envsubst man page

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 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.

Reporting Bugs

Report bugs to <bug-gnu-gettext@gnu.org>.

Referenced By


June 2016 GNU gettext-runtime GNU