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If your sed version supports the -i (in place) option:
sed -i 's!SCGIMount /RPC3 127.0.0.1:5001!SCGIMount /RPC3 127.0.0.1:5000!' apache2.conf
Otherwise:
sed 's!SCGIMount /RPC3...

If you want to add the line to the end of the file, then this will do:echo "SCGIMount /RPC3 127.0.0.1:5001" >> apache2.conf

sed "s!changeusername!$username!" /etc/init.d/$username


The single tics prevent shell evaluation of variables.