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docs(env-file): improve document description

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Signed-off-by: Black-Hole1 <bh@bugs.cc>
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Black-Hole1
2023-07-31 10:00:56 +08:00
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docs/source/markdown/options/env-file.md
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####> are applicable to all of those.
#### **--env-file**=*file*
Read in a line-delimited file of environment variables.
Read the environment variables from the file, supporting prefix matching: `KEY*`, as well as multiline values in double quotes and single quotes, but not multiline values in backticks.
The env-file will ignore comments and empty lines. And spaces or tabs before and after the KEY.
If an invalid value is encountered, such as only an `=` sign, it will be skipped. If it is a prefix match (`KEY*`), all environment variables starting with KEY on the host machine will be loaded.
If it is only KEY (`KEY`), the KEY environment variable on the host machine will be loaded.
Compatible with the `export` syntax in **dotenv**, such as: `export KEY=bar`.