grep -v grepis not going to do a lot.
grep -v grepis a pattern you might use in the middle of a series of piped commands.
ps aux | grep bash
grep -v greplike this:
ps aux | grep bash | grep -v grep
ps aux | grep -v grep | grep bash
alias grep='grep --color=auto -n'in your .bashrc. Then the 2nd version will leave the instances of "bash" highlighted/colourised in the final output because
grep bashwas the last pattern in the piped sequence.
grep -v grep, which filters the results to exclude anything from the previous results that includes "grep". So there will be nothing to highlight!
man grep, or its info pages using