Compare Files | CMP | COMM | DIFF

Compare Files :













Command is "cmp"  -- compares byte by byte

comparing two files byte by byte and it will show the first different byte.

cmp <file1.txt> <file2.txt> 

Compare only given bytes 

cmp -n 100 <file1.txt> <file2.txt>  

to compare only given number of bytes use flag "-n"







Verbose command "-l"

cmp -l file1.txt file2.txt

The bytes started changed from 202 and then eac byte changes.

















Print only different Bytes   -- use -b flag

cmp -b file1.txt file2.txt


COMM command

Comm compares two sorted files line by line.


Display only common data between the two files

comm -1 -2 file1.txt file2.txt   // -1 remove col 1 , -2 remove column 2 and display only the common column

DIFF COMMANDS

COMM command is also used to compare line by line. Here we get three columns

-- Data that is different in file 1 and Data that is different in file 2 and common data

DIFF : Diff command only displays different lines










diff file1.txt file2.txt

-q flag says "the files differ message is displayed instead of showing what is different"

diff -q file1.txt file2.txt

-s : flag if the files are same you will get a success message

diff -s file1.txt file2.txt

It will tell you that file 1 and file 2 are identical.

-y : flag it will show all the lines parallely 










If there are any lines that are different it will show a pipe "|" symbol in the middle of that

If you want to display only those lines that are different ignore similar lines.

diff -y --suppress-common-lines file1.txt file2.txt

--suppress-common-lines  // this is used.


If you want to display all the common lines 

diff -y --left-column file1.txt file2.txt

display all the common lines on the left column and display different lines on the right column
















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