Compare Files and Directories

compare two directories	diff /directory1 /directory2
compare two files	cmp file1 file2
compare two files and show specific differences-i=ignore case-b=ignore blanks-w=ignore spaces and tabs	diff -iwb file1 file2
compare two files side-by-side| lines are the same< line is in first file only> line is in second file only	sdiff file1 file2
compare two files side-by-side showing only differences	sdiff -s file1 file2