Use bash-internal globs and parameter expasion in preference to
assignment from output of ls or basename per file/directory.
When displaying file contents, call sed once and preprocesses the entire
file (eg pihole.toml), rather than spawning a new sed process for every
line of the file.
When checking services, call awk once to extract all data for each ip:port
pair, rather than three times.
Signed-off-by: Rob Gill <rrobgill@protonmail.com>
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