Set Operations on Lines of Files

Things under legendu.net/outdated are outdated technologies that the author does not plan to update any more. Please look for better alternatives.

** Things under legendu.net/outdated are outdated technologies that the author does not plan to update any more. Please look for better alternatives. **

It is suggested that you use Python instead of shell script to manipulate text files!

1. Union lines in 2 files.

   comm f1 f2
   

   Or you can use

   cat f1 f2 | sort -u | uniq -u
   

2. Show symmetric difference

   comm -3 file1 file2
   

3. Show difference of 1 and 2

   comm -23 file1 file2
   

Note that lines in files must be sorted first if you use the command comm. To sort lines in a file, you can use the following command.

sort file -o file