diff - differential file comparator

diff [-efbwr] file1... file2

Description

The diff command tells what lines must be changed in two files to bring them into agreement.


If one file is a directory	then a file in that directory with a basename the same as that of the other file is used
If both files are directories	similarly named files in the two directories are compared by the method of diff for text files and cmp otherwise
If more than two file names are given	then each argument is compared to the last argument as above

-e	The -e option produces a script of a, c and d commands for the Unix system editor ed, which will recreate file2 from file1.
-f	The -f option produces a similar script, not useful with ed, in the opposite order. It may, however, be useful as input to a stream-oriented post-processor.
-b	The -b option causes trailing blanks (spaces and tabs) to be ignored and other strings of blanks to compare equal.
-w	The -w option causes all white space to be removed from input lines before applying the difference algorithm.
-r	The -r option causes diff to process similarly named subdirectories recursively.