CODEWITHSUNDEEP
bashsedawkgrep
Jason
Jason

Reputation: 794

sed to read one file and delete pattern in second file

I have a list of users that have logged in during the past 180 days and a list of total users from LDAP. Each list is within text file and each name is on its own line. With sed or awk can I have a script read from current-users.txt and delete from total-users.txt to give me a text document that has all of the inactive accounts for the past 180 days?

Thanks in advance!

Upvotes: 0

Views: 83

Answers (2)

BMW
BMW

Reputation: 45353

Using awk

awk 'NR==FNR{a[$1];next} !($1 in a)' current_users total_users

Upvotes: 1

fedorqui
fedorqui

Reputation: 290515

No need to sed or awk, grep suffices:

grep -vf current-users.txt total-users

It returns all the lines that are in total_users but not in current-users.txt.

  • grep -f gets parameters from a file.
  • grep -v inverts the result.

Example

$ cat total_users 
one
two
three
four

$ cat some_users 
two
four

$ grep -vf some_users total_users 
one
three

Upvotes: 2

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