diff Command output format description

Diff's Output format: Change-command < From-file-line < From-file-line ... --- > To-file-line > To-file-line ... The format of the diff command is used in the following ways: Diff From-file To-fille If you modify from-file according to the output Change-command, you can get the same file content as To-file. Lar exmaple:8a12,15 in the 8th line of the first file, insert the 2nd file 12-15 lines of text, so that the contents of the 1th file and 2nd file, in the 2nd 12-15 lines deleted, the file content will be the same as the first file FCT example:5,7c8,10 5-7 lines in the first stall to 8-10 lines in the 2nd file, and the contents of the 1th file are the same as the 2nd file. The RDL example:5,7d3 removes 5-7 lines from the 1th file, making the 1th file the same as the 2nd file. To modify the contents of the 2nd file so that it is the same as the 1th file, insert the 5-7 line of the 1th file at the 2nd document 3rd line.