[SOLVED] How to remove lines which match lines in another document

Issue

So I am running Centos 6.9, but could switch to Centos 7 if needed

If I have 2 txt files, one contains

Gold
Silver
Copper
Aluminum
Titanium

And my second contains

Gold
Silver
Titanium

How can I run a command to have a file that contains

Copper
Aluminum

Summarized: How can I remove lines in a file which match those of another file

Solution

This can easily be done with grep

laforge@ncc1701d:~ $ cat file1.txt
Gold
Silver
Copper
Aluminum
Titanium
laforge@ncc1701d:~ $ cat file2.txt
Gold
Silver
Titanium
laforge@ncc1701d:~ $ grep -vf file2.txt file1.txt
Copper
Aluminum
laforge@ncc1701d:~ $ grep -f file2.txt file1.txt
Gold
Silver
Titanium
laforge@ncc1701d:~ $

Answered By - lpaseen