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SSH one-liner PermitRootLogin

December 17, 2013

# sed -i 's/PermitRootLogin yes/PermitRootLogin no/g' /etc/ssh/sshd_config

Attempt to match regexp against the pattern space. If success- ful, replace that portion matched with replacement. The replacement may contain the special character & to refer to that portion of the pattern space which matched, and the special escapes \1 through \9 to refer to the corresponding matching sub-expressions in the regexp.

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