To compare the contents of two files:
diff email addresses 2a3,4 > Jean JRS@pollux.ucs.co > Jim jim@frolix8
This displays a line by line difference between the file email and addresses.
To make these files match you need to add (a) lines 3 and 4 (3,4) of the file addresses (>) after line 2 in the file email.
Here are the contents of files email and addresses used in this example. Line numbers are shown at the beginning of each line to help you follow this example.
email addresses 1 John erpl08@ed 1 John erpl08@ed 2 Joe CZT@cern.ch 2 Joe CZT@cern.ch 3 Kim firstname.lastname@example.org 3 Jean JRS@pollux.ucs.co 4 Keith keith@festival 4 Jim jim@frolix8 5 Kim email@example.com 6 Keith keith@festival
To compare two files ignoring differences in the case of the letters and blank spaces:
diff -iw part1 part_one
Lines in the two files that differ only in case and by the number of spaces they contain are considered to be identical.