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I have a regular expression question. Currently, I am running the following command to get a list of all users on my box. How can I modify the following script to exclude users: group1, group2, group3.... I know I need to pipe it into grep, but I am unsure if this is a good approach?
But first, let's be clear about the filtering criteria. In the output of "ls -l", you have fields for file owner and for the group. Which field do you want to act on? The best thing is to post a sample output and tell us which lines you would like saved. Also, do you want to whole content of ls -l, or just the file name?
note that in your example output you've got the username and group for the 1st 2 lines, but only the username for the 2nd 2 lines. Seems inconsistent.
It is an editted post. I did not want to post student data in my post... I will post one with users who are fake to make it easier to work with. I am trying to get only the users who do NOT have group within their username.