$attrs{command} is a specific attribute. Checking for existence before attempting to access a value (e.g. ... $attrs{command} eq 'some_value' ...) avoids autovivification; depending on what other code you write, this may or may not be important.

However, the main point I was trying to get across was that %attrs eq "command" was not doing what you wanted/intended/expected. The following short piece of code may help to further explain this:

$ perl -Mstrict -Mwarnings -E '
> my %x = (a => 1);
> say +(%x eq q{a}) ? 1 : 0;
> say %x;
> say qq{@{[%x]}};
> '
0
a1
a 1
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