Why is this "can't break line" warning from grep of gcc man page? -

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i trying find line ending -s following command got warnings:

$ man gcc | grep '\-s$' <standard input>:4808: warning [p 54, 13.2i]: can't break line $ man gcc | egrep '\-s$' <standard input>:4808: warning [p 54, 13.2i]: can't break line

below development environment:

$ uname -a linux localhost 3.16.0-4-amd64 #1 smp debian 3.16.7-ckt20-1+deb8u1 (2015-12-14) x86_64 gnu/linux  $ gcc --version gcc (debian 4.9.2-10) 4.9.2 copyright (c) 2014 free software foundation, inc. free software; see source copying conditions.  there no warranty; not merchantability or fitness particular purpose.


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