Diffutils includes four utilities: diff, cmp, diff3 and sdiff.
+ Diff compares two files and shows the differences, line by line.
+ The cmp command shows the offset and line numbers where two files differ,
 or cmp can show the characters that differ between the two files.
+ The diff3 command shows the differences between three files. Diff3 can be
 used when two people have made independent changes to a common original;
 diff3 can produce a merged file that contains both persons' changes and
 warnings about conflicts.
+ The sdiff command can be used to merge two files interactively.

• Dmitry V. Levin
• Anton D. Kachalov
• Stanislav Ievlev

• diffutils