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Full Discussion: formatting a file and removing duplicates
Top Forums Shell Programming and Scripting formatting a file and removing duplicates Post 302561953 by Corona688 on Wednesday 5th of October 2011 03:12:58 PM
Old 10-05-2011
Code:
$ awk 'BEGIN { ORS=", " } !A[$1]++' < data
HI, Joe, Bob, Jack, 
$

First, we set ORS=", " so it prints ", " instead of \n for each "line".

The next is an expression telling it when to print. If it was '1', it'd print an item for each and every line of input. If it was 0, it'd print nothing at all.

The expression !A[$1]++ tells it to print the entire line only when the line's first field ($1) hasn't been found before. So the first time it looks for Jack, it sees that A["Jack"] is zero and prints. The ++ then adds 1 to that. Next time, it sees A["Jack"] is 1 and skips printing it.
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LEARN ABOUT HPUX

listusers

listusers(1)						      General Commands Manual						      listusers(1)

NAME

       listusers - display user login data

SYNOPSIS

       groups] logins]

DESCRIPTION

       The  command  displays  data  concerning user logins.  The output shows the user login and the comment field value (for example, user name,
       location).  The default displays data about all user logins.

   Options
       The command supports the following options:

	      Display only users who have
			     groups, as their primary group. Use with the option.

	      Display only users who have
			     groups, as their supplementary group.  Use with the option.

	      Display all users belonging to
			     groups, sorted by login.  A comma separated list specifies multiple groups.

	      Display the requested
			     logins.  A comma separated list specifies multiple logins.

	      Display only users belonging to the specified repository,
			     either for NIS or users.

       A user login has a UID of 100 or greater.

       When the and options are combined, a user login is only displayed once, even though the login may belong to multiple specified groups.

EXAMPLES

       List all user logins.

       List all user logins in the group and the users removing all duplicates.

       List all users who have as their primary group.

       List all users who have as their supplementary group.

       List only local user logins.

       List only NIS user logins.

FILES

SEE ALSO

       passwd(1), logins(1M), group(4), passwd(4).

STANDARDS CONFORMANCE

																      listusers(1)
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