From the systemd.service docs:
Use "${FOO}" as part of a word, or as a word of its own, on the command
line, in which case it will be replaced by the value of the environment
variable including all whitespace it contains, resulting in a single
argument. Use "$FOO" as a separate word on the command line, in which
case it will be replaced by the value of the environment variable split
at whitespace, resulting in zero or more arguments.
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|---|---|---|
| .. | ||
| influxdb.service | ||
| init.sh | ||
| logrotate | ||
| post-install.sh | ||
| post-uninstall.sh | ||
| pre-install.sh | ||