man.string.subst.map.local.pre string man.string.subst.map.local.pre Specifies “local” string substitutions Use the man.string.subst.map.local.pre parameter to specify any “local” string substitutions to perform over the entire roff source for each man page before performing the string substitutions specified by the man.string.subst.map parameter. For details about the format of this parameter, see the documentation for the man.string.subst.map parameter.