I'm trying to compare the difference of two files which are a list of packages before and after an update and displaying it in a form that is easily readable.
Basically some of my contents would be like this:
Pre-update:
2:tar-1.23-13.el6.x86_64/
tcp_wrappers-libs-7.6-57.el6.x86_64/
14:tcpdump-4.0.0-5.20090921gitdf3cb4.2.el6.x86_64/
3:traceroute-2.0.14-2.el6.x86_64/
Post Update:
2:tar-1.23-15.el6_8.x86_64/
tcp_wrappers-libs-7.6-57.el6.x86_64/
14:tcpdump-4.0.0-5.20090921gitdf3cb4.2.el6.x86_64/
3:traceroute-2.0.14-2.el6.x86_64/
samba-common-3.6.23-43.el6_9.x86_64/
samba-winbind-clients-3.6.23-43.el6_9.x86_64/
samba-winbind-3.6.23-43.el6_9.x86_64/
Expected Output:
Pre-Update | Postupdate
2:tar-1.23-13.el6.x86_64/ | 2:tar-1.23-15.el6_8.x86_64/
(empty) | samba-common-3.6.23-43.el6_9.x86_64/
(empty) | samba-winbind-clients-3.6.23-43.el6_9.x86_64/
(empty) | samba-winbind-3.6.23-43.el6_9.x86_64/
Basically show the updates under both files and the additions only under the new file.
I don't mind other ways of displaying it as long as it nicely formatted so like oldpackagename --> newpackagename or something along that route.
If you would like nice side-by-side output, you can use:
$ diff -y --suppress-common-lines file1.txt file2.txt
Example Use/Output
$ diff -y --suppress-common-lines file1.txt file2.txt
2:tar-1.23-13.el6.x86_64/ | 2:tar-1.23-15.el6_8.x86_64/
> samba-common-3.6.23-43.el6_9.x86_64/
> samba-winbind-clients-3.6.23-43.el6_9.x86_64/
> samba-winbind-3.6.23-43.el6_9.x86_64/