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sed -i '/#%%%HOME.HOSTS/,/#%%%/s/^#\([^%]\)/\1/g' hostsand about the section in hosts file please. I'm really not understand why :(sedto add or remove a # at the beginning of the lines between two #%%% lines. This will comment or un-comment the lines. The example shows how to comment the HOME.HOSTS section using #%%%HOME.HOSTS ; you should use #%%%WORK.HOSTS instead in the sed command to comment or un-comment the WORK.HOSTS section.