Compares two text files. diff reports lines that differ between
file2. Output consists of lines of context from each file, with
file1 text flagged by a
< symbol, and
file2 text by a
> symbol. Context lines are preceded by the ed command (a, c, or d) that converts
file2. If one of the files is -, standard input is read. If one of the files is a directory, diff locates the filename in that directory corresponding to the other argument (e.g., diff dir junk is the same as diff dir/junk junk). If both arguments are directories, diff reports lines that differ between all pairs of files having equivalent names (e.g., olddir/program and newdir/program); in addition, diff lists filenames unique to one directory, as well as subdirectories common to both. See also
Options -c, -C, -D, -e, -f, -h, and -n can't be combined with one another (they are mutually exclusive).
Treat all files as text files. Useful for checking to see if binary files are identical.
Ignore repeating blanks and end-of-line blanks; treat successive blanks as one.
Ignore blank lines in files.
Context diff: print
n lines surrounding each changed line. The default context is three lines.
format to output a line group containing differing lines from both files in if-then-else format.
Ignore segments of numerous ...