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Full Discussion: extract column with awk
Top Forums Shell Programming and Scripting extract column with awk Post 302705253 by xshang on Monday 24th of September 2012 01:08:10 PM
Old 09-24-2012
Sorry, I can't express clearly what I mean.

The txt file could be understand like this:

ID CDR1 CDR2 CDR3
1 CDR1 NULL CDR3
2 CDR1 CDR2 CDR3
3 NULL NULL CDR3

The results I want to get should be four "CDR3". "NULL" here represents blank space, so maybe I should deal with the original file?

Thanks a lot!

Quote:
Originally Posted by in2nix4life
Code:
cat file

ID CDR1 CDR2 CDR3
1 CDR1   CDR3
2 CDR1 CDR2 CDR3
3     CDR3

awk '$4 == ""{$4="NULL"}{print $4}' file

CDR3
NULL
CDR3
NULL

---------- Post updated at 12:08 PM ---------- Previous update was at 11:50 AM ----------

Sorry, I can't express clearly what I mean. I use space as the separator.

The txt file could be understand like this:

ID CDR1 CDR2 CDR3
1 CDR1 NULL CDR3
2 CDR1 CDR2 CDR3
3 NULL NULL CDR3

The results I want to get should be four "CDR3". "NULL" here represents blank space, so maybe I should deal with the original file?

Thanks a lot!

Quote:
Originally Posted by Corona688
What separator is used in your text file? Tab, space?

You might be able to tell it to use a single space or tab as the separator rather than globbing all whitespace...

Code:
awk -F"\t" '{ print $1,$4 }'
awk -F" " '{ print $1,$4 }'

 

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mysqmail-logger(8)					      System Manager's Manual						mysqmail-logger(8)

NAME
mysqmail-courier-logger - logs courier-imap traffic to a mysql database SYNOPSIS
mysqmail-courier-logger subprogram [ args ... ] DESCRIPTION
mysqmail-courier-logger reads the syslog using tail -F, and for each dovecot lines of POP3 and IMAP corresponding to a disconnection, mysq- mail-courier-logger writes the total used bandwidth corresponding to the username. Configuration is read from /etc/mysqmail.conf. mysqmail-courier-logger uses a table corresponding to this one: CREATE TABLE IF NOT EXISTS pop_access ( id varchar(32) NOT NULL default '', uid int(11) NOT NULL default '65534', gid int(11) NOT NULL default '65534', home varchar(255) NOT NULL default '', shell varchar(255) NOT NULL default '', mbox_host varchar(120) NOT NULL default '', crypt varchar(50) NOT NULL default '', passwd varchar(50) NOT NULL default '', active int(11) NOT NULL default '1', start_date date NOT NULL default '0000-00-00', expire_date date NOT NULL default '0000-00-00', quota_size int(11) NOT NULL default '0', type varchar(20) NOT NULL default 'default', memo text,du bigint(20) NOT NULL default '0', another_perso varchar(5) NOT NULL default 'no', redirect1 varchar(255) default NULL, redirect2 varchar(255) default NULL, localdeliver varchar(10) NOT NULL default 'yes', pop3_login_count int(9) NOT NULL default '0', pop3_transfered_bytes int(14) NOT NULL default '0', imap_login_count int(9) NOT NULL default '0', imap_transfered_bytes int(14) NOT NULL default '0', last_login int(14) NOT NULL default '0', PRIMARY KEY (id,mbox_host) ) TYPE=MyISAM To have mysqmail-courier-logger working, you should have issued mkfifo /var/log/courier.fifo to create the fifo and use nohup cat /var/log/courier.fifo | /usr/bin/mysqmail-courier-logger > /dev/null 2>&1 & to launch it. VERSION
This documentation describes mysqmail-courier-logger version 0.1.4. See http://gplhost.com/softwares-mysqmail.html for updates. SEE ALSO
qmail-send(3), syslog(3), logger(8) mysqmail-logger(8)
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