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Full Discussion: Comparing two columns
Top Forums Shell Programming and Scripting Comparing two columns Post 302383905 by deindorfer on Friday 1st of January 2010 08:58:21 PM
Old 01-01-2010
When I say "my third attempt" I mean the one-liner shown here, it accounts for duplicates, extra white space and outputs the line feed after every match.

Code:
[root@localhost cols]# cat dat
1 1
2 2
3   13
4
10
19
234
3  14
4   4
5 5
112 13
[root@localhost cols]# perl -ane '$F[1]!=$F[0]&&$F[1]&&print$F[1],"\n"' dat
13
14
13

I guess when you add the -l back in, the "\n" becomes unnecessary, so: no, not better than "that". You are correct Smilie

Last edited by deindorfer; 01-01-2010 at 10:05 PM.. Reason: Correction
 

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lppasswd(1)							    Apple Inc.							       lppasswd(1)

NAME
lppasswd - add, change, or delete digest passwords. SYNOPSIS
lppasswd [ username ] lppasswd -a [ -g groupname ] username lppasswd -x username DESCRIPTION
lppasswd adds, changes, or deletes passwords in the CUPS digest password file, passwd.md5. When run by a normal user, lppasswd will prompt for the old and new passwords. When run by the super-user, lppasswd can add new accounts (-a username), change existing accounts (user- name), or delete accounts (-x username) in the digest password file. Digest usernames do not have to match local UNIX usernames. OPTIONS
lppasswd supports the following options: -g groupname Specifies a group other than the default system group. SECURITY ISSUES
By default, the lppasswd program is not installed to allow ordinary users to change their passwords. To enable this, the lppasswd command must be made setuid to root with the command: chmod u+s lppasswd While every attempt has been made to make lppasswd secure against exploits that could grant super-user privileges to unprivileged users, paranoid system administrators may wish to use Basic authentication with accounts managed by PAM instead. SEE ALSO
lp(1), lpr(1), http://localhost:631/help COPYRIGHT
Copyright 2007-2011 by Apple Inc. 22 February 2008 CUPS lppasswd(1)
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