Question

I need to manage lists with find-command. Suppose the lists have random names in non-distinct lists (ie their intersection is not empty set). How can I do:

A \ B

find files in the list A except the files in the list B

A intersection B

find files common to the lists A and B

Please, consult here.

A union B

find all files in the two lists

EXAMPLES

$ find . | awk -F"/" '{ print $2 }'

.zcompdump
.zshrc
.bashrc
.emacs

$ find ~/bin/FilesDvorak/.* -maxdepth 0 | awk -F"/" '{ print $6 }'

.bashrc
.emacs
.gdbinit
.git

I want:

A \ B:

.zcompdump
.zshrc

A Intersection B:

.bashrc
.emacs

A Union B:

.zcompdump
.zshrc
.bashrc
.emacs
.bashrc
.emacs
.gdbinit
.git

A try for the Intersection

When I save the outputs to separate lists, I cannot understand why the command does not take the common things, ie the above intersection:

find -f all_files -and -f right_files .

Questions emerged from the question:

1. find ~/bin/FilesDvorak/.* -maxdepth
   0 -and ~/.PAST_RC_files/.*

2. Please, consult for recursive find
   Click
   here!

3. find ~/bin/FilesDvorak/.* -maxdepth
   0 -and list

Answer 1

Seriously, this is what comm(1) is for. I don’t think the man page could be much clearer: http://linux.die.net/man/1/comm