NAME

envsub — environment variable preprocessor

SYNOPSIS

envsub [var ...]

The envsub preprocessor substitutes percent (“%”) delimited environment variables with their values. To escape a variable, use two percent signs.

By default, all defined variables are expanded. If var arguments are provided, restrict to the named variables.

The envsub utility exits 0 on success, and >0 if an error occurs.

Expand VERSION and PREFIX in script:

$ VERSION=0.1.0 envsub VERSION PREFIX
  < script

Print “%V%: xyz”:

$ echo '%%V%%: %V%' | V=xyz
  envsub