CODEWITHSUNDEEP
linuxshellunixdiff
Kay
Kay

Reputation: 2067

Compare two files and write the unmatched numbers in a new file

I have two files where ifile1.txt is a subset of ifile2.txt.

ifile1.txt   ifile2.txt
    2            2
    23           23
    43           33
    51           43
    76           50
    81           51
   100           72
                 76
                 81
                 89
                100

Desire output

ofile.txt
   33
   50
   72
   89

I was trying with 

diff ifile1.txt ifile2.txt > ofile.txt

but it is giving different format of output.

Upvotes: 0

Views: 1309

Answers (3)

Uruk-hai
Uruk-hai

Reputation: 659

You could try:

diff file1 file2 | awk '{print $2}' | grep -v '^$' > output.file

Upvotes: 1

Barmar
Barmar

Reputation: 780974

Since your files are sorted, you can use the comm command for this:

comm -1 -3 ifile1.txt ifile2.txt > ofile.txt

-1 means omit the lines unique to the first file, and -3 means omit the lines that are in both files, so this shows just the lines that are unique to the second file.

Upvotes: 2

Steephen
Steephen

Reputation: 15824

This will do your job:

diff file1 file2 |awk '{print $2}'

Upvotes: 1

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