[mbarsky@src-code]$ script session1

[mbarsky@src-code ~]$ cd w1

[mbarsky@src-code w1]$ cat colors.1
red
blue
orange
green
pink

[mbarsky@src-code w1]$ cat colors.1
red
blue
orange
green
pink

#=========================================
#1. diff command in unified format: diff -u
#==========================================
[mbarsky@src-code w1]$ diff -u colors.1 colors.2

--- colors.1	2018-01-28 13:20:23.068000000 -0500

+++ colors.2	2018-01-28 13:21:40.443000000 -0500

@@ -1,5 +1,6 @@

-red

 blue

-orange

+red

+brown

 green

-pink

+purple

+

#-------------------------------
# piping sorted files as input to diff
#-------------------------------------

[mbarsky@src-code w1]$ diff -u <(sort colors.1) <(sort colors.2)

--- /dev/fd/63	2018-01-28 13:25:22.103000000 -0500

+++ /dev/fd/62	2018-01-28 13:25:22.103000000 -0500

@@ -1,5 +1,6 @@

+

 blue

+brown

 green

-orange

-pink

+purple

 red

 #======================================================================
 # 2. comm creates 3 columns: only in file1, only in file2, in both files
 #=======================================================================
[mbarsky@src-code w1]$ comm colors.1 colors.2

	blue

		red

comm: file 1 is not in sorted order

comm: file 2 is not in sorted order

blue

	brown

	green

orange

green

pink

	purple



[mbarsky@src-code w1]$ comm <(sort colors.1) <(sort colors.2)



		blue

	brown

		green

orange

pink

	purple

		red

#--------------------------------
# to get only common - supress columns 12		
#-----------------------------------------
[mbarsky@src-code w1]$ comm -12 <(sort colors.1) <(sort colors.2)

blue

green

red



[mbarsky@src-code w1]$ exit

exit

#========================================================================================
# NOW remove unreadable characters and convert to the format to read on your operating system
#==========================================================================================

[mbarsky@src-code ~]$ col -bp < session1 > session1.txt
[mbarsky@src-code ~]$ unix2dos session1.txt