UNIX for Dummies Questions & Answers

Hello All - I am looking for help on how to solve a re-occuring problem. I have a file with certain sequences in it that need to be removed. The sequences are always different but the fix is always the same remove those sequences and leave the rest. Another team ID's the bad sequences and then I have to remove them. I was using the following command,however, now that I am getting lists of 60 + sequences to remove it doesn't seem like the best way anymore:

grep -v 1234 file | grep -v 5678 | grep -v AAAA | grep -v > newfile

I was trying to write something where I could run the same command or script on the new lists each day but I can't figure it out as my knowledge is limited at best.

Thanks in advance for any help you can give!

You can use the "-f" option on grep, then you only need to generate a file
with the list-pattern.
Example:

Code:

$more list
no
1
3
$more text
line1
no line
the 3 line
the 4 line
$grep -f list -v text 
the 4 line

You might already have your answer, but for my own curosity I'm just trying to understand it as well.

Input: File
Output = Input - lines that contain the specified sequences.
Sequences: You can have any number of sequences each time and each sequence can be of any length?
sequence1 - 1234
sequence2 - 5678
sequence3 - AAAA


Your current code is: n= the number of sequences.

Code:

grep -v sequence1 input file | grep -v sequence2 | grep -v sequence3 | grep -v sequenceN > newfile

So, he would take the sequences that he's given, put them in a file, then run:

Code:

grep -v -f sequence file input file

And to output to a new file just add > newfile at the end of the above grep code? Or would it be | cat >> newfile?
I'm not sure what the above code is that isn't the "$grep -f list -v text" line. What topic is that if I wanted to understand it?

this code is only and example for using "-f" option whith grep, to make te example i generate one file call list and other call text.
The file list is only a file of patterns and file text is where we want to apply the patterns.
You solution is the same solution that i'm propose.See the code:

Code:

Your code :grep -v -f sequence file input file
My code   :grep -f list -v text