Mateusz Piotrowski f9ab72bb47 Read commands from stdin when -f - is passed to sed(1)
This patch teaches sed to interpret a "-" in a special way when given
as an argument to the -f flag.

This behavior is also present in GNU sed.

PR:		244872
Tested by:	antoine (exp-run)
Reviewed by:	pfg, tobik (older version)
Approved by:	pfg (src)
Relnotes:	yes
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D24079
2020-06-10 19:23:58 +00:00
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