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I tried to use the sed command to do some text replacement,

sed -i 's/port=\"8080\"/port="\8000\"' /opt/apache-tomcat-7.0.37/conf/server.xml 

But I meet this error:

sed: -e expression #1, char 9: unterminated `s' command

What is the problem?

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Unterminated `s' command means you are missing a delimiter. You need 3 and have just 2 in your command.

sed -i 's/port=\"8080\"/port="\8000/"' /opt/apache-tomcat-7.0.37/conf/server.xml 

I flipped the last \ to / and it works:

more test
  port="8080"
sed -i 's/port="8080"/port="8000"/' test
more test
  port="8000"
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