Unary "-" performs arithmetic negation if the operand is numeric. If the operand is an identifier, a string consisting of a minus sign concatenated with the identifier is returned. Otherwise, if the string starts with a plus or minus, a string starting with the opposite sign is returned. One effect of these rules is that -bareword is equivalent to "-bareword".

[me@host]$ perl -le 'use strict; print -foo; print -"-foo"; print -"+f
+oo";'
-foo
+foo
-foo
[me@host]$
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:Wq
Not an editor command: Wq
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