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Top Forums Shell Programming and Scripting finding duplicates in columns and removing lines Post 302188995 by totus on Thursday 24th of April 2008 04:04:05 PM
Old 04-24-2008
Data finding duplicates in columns and removing lines

I am trying to figure out how to scan a file like so:

1 ralphs office","555-555-5555","ralph@mail.com","www.ralph.com
2 margies office","555-555-5555","ralph@mail.com","www.ralph.com
3 kims office","555-555-5555","kims@mail.com","www.ralph.com
4 tims office","555-555-5555","tims@mail.com","www.ralph.com

and end up with this:

1 ralphs office","555-555-5555","ralph@mail.com","www.ralph.com
3 kims office","555-555-5555","kims@mail.com","www.ralph.com
4 tims office","555-555-5555","tims@mail.com","www.ralph.com

specifically, I'm needing to look for duplicates in column 3 in csv file, if a duplicate is found, remove "lines" based on duplicates found in column 3. In the instance above line two is removed or filtered.

Does anyone know if the unix uniq command can be utilized or perl? uniq doesn't seen to have a delimiter flag to use only character count or bit.

Thanks!
TotusSmilie

Last edited by totus; 04-24-2008 at 05:31 PM..
 

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PUSH(8)                                                     BSD System Manager's Manual                                                    PUSH(8)

NAME
push -- fetch mail via POP SYNOPSIS
push [-5 | --krb5] [-v | --verbose] [-f | --fork] [-l | --leave] [--from] [-c | --count] [--headers=headers] [-p port-spec | --port=port-spec] po-box filename DESCRIPTION
push retrieves mail from the post office box po-box, and stores the mail in mbox format in filename. The po-box can have any of the follow- ing formats: 'hostname:username' 'po:hostname:username' 'username@hostname' 'po:username@hostname' 'hostname' 'po:username' If no username is specified, push assumes that it's the same as on the local machine; hostname defaults to the value of the MAILHOST environ- ment variable. Supported options: -5, --krb5 use Kerberos 5 (if compiled with support for Kerberos 5) -f, --fork fork before starting to delete messages -l, --leave don't delete fetched mail --from behave like from. -c, --count first print how many messages and bytes there are. --headers=headers a list of comma-separated headers that should get printed. -p port-spec, --port=port-spec use this port instead of the default 'kpop' or '1109'. The default is to first try Kerberos 5 authentication and then, if that fails, Kerberos 4. ENVIRONMENT
MAILHOST points to the post office, if no other hostname is specified. EXAMPLES
$ push cornfield:roosta ~/.emacs-mail-crash-box tries to fetch mail for the user roosta from the post office at ``cornfield'', and stores the mail in ~/.emacs-mail-crash-box (you are using Gnus, aren't you?) $ push --from -5 havregryn tries to fetch From: lines for current user at post office ``havregryn'' using Kerberos 5. SEE ALSO
from(1), pfrom(1), movemail(8), popper(8) HISTORY
push was written while waiting for movemail to finish getting the mail. HEIMDAL May 31, 1998 HEIMDAL
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