envsubst - Online in the Cloud

PROGRAM:

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.

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