By: Editorial Staff BARRING LAST-MINUTE hitches, on Jan. 18 Pittsburgh will simultaneously get its own daily newspaper for the first since May ? and will join the long list of one-paper cities. Blade Communications Inc. said it is set to resume publication of the Pittsburgh Post-Gazette on that day. On New Year's Eve, the U.S. Justice Department announced that it would not challenge the sale of the Pittsburgh Press to Blade, which will shut the afternoon paper down. E.W. Scripps Co. closed the sale of the Press to the publisher of the Post-Gazette on the day the Justice Department made its announcement. Blade will pay a reported $100 million in cash and preferred stock and is transferring ownership of its Monterey, Calif., paper, The Herald, to Scripps. Until a walkout by Teamster circulation workers in May, the Press and Post-Gazette had been published under a joint operating agreement controlled by Scripps. "It's been a long, tough grind, and I am happy," Post-Gazette chairman William Block Sr. told the Associated Press. Richard Mellon Scaife, publisher of the Tribune Review in Greensburg, had urged the Justice Department to reject the sale. The Tribune Review recently began publishing a Pittsburgh edition.