Simulate tac with sed command

Use the sed command to simulate the original tac data www.2cto. comShell code catdataThisistheheaderline. thisisthefirstdataline. thisistheseconddataline. thisisthelastline. shell code... use the sed command to simulate the original tac data www.2cto.com Shell code cat data This is the header line. this is the first data line. this is the second data line. this is the last line. shell code tac data This is the last line. this is the second data line. this is the first data line. this is Header line. Shell code www.2cto.com sed-n' {1! G; h; $ p} 'data This is the last line. This is the second data line. This is the first data line. This is the header line.