in reply to Remove a line from a file using perl one liner

Depends on the OS, but on *NIX, 
perl -ne 'next if m,^Alias /icons/,; print' < one.txt > tmp.txt && mv 
+tmp.txt one.txt

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or, if you're feeling brave... 
perl -i -ne 'next if m,^Alias /icons/,; print' one.txt

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should do the trick.

A user level that continues to overstate my experience :-))

In Section Seekers of Perl Wisdom