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Things under legendu.net/outdated are outdated technologies that the author does not plan to update any more.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** Things under legendu.net/outdated are outdated technologies that the author does not plan to update any more.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

    :::bash
    comm f1 f2

   Or you can use

    :::bash
    cat f1 f2 | sort -u | uniq -u

2. Show symmetric difference

    :::bash
    comm -3 file1 file2

3. Show difference of 1 and 2

    :::bash
    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.

:::bash
sort file -o file