printing each users by processes Post: 302190055

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Top Forums Shell Programming and Scripting printing each users by processes Post 302190055 by era on Monday 28th of April 2008 03:13:38 PM

04-28-2008

Registered User

The correct syntax is

Code:

while read users

What you have tries to evaluate the value of $users as a command, thus you get "root: command not found" (because the first user is root, so that is the command, and the rest of the users are passed as arguments to this command).

Why do you extract users from /etc/passwd when you end up reading them from users? On my system, users prints the same user multiple times if they are logged in multiple times, which might not be what you want.

Here's the whole script with the problems fixed:

Code:

#!/bin/bash
users | tr '. ' '
' | sort -u | while read user
do
  ps -U "$user"
done

The second argument to tr is a newline inside single quotes; opening quote, end of line, new line, closing quote. Yes, that's a valid string in bash (and sh generally). This breaks up the output of users on multiple lines so we can sort -u to get rid of any duplicates.

The output of users on my Ubuntu box doesn't have any full stops in it, but maybe yours is different.

I also took out the (as far as I could tell) gratuitous echo `backticks` and the temporary assignment of the output of users to a variable which only got used once. Oh, and I fixed the shebang line -- there should be no slash after bash, and one before bin.

Last edited by era; 04-28-2008 at 04:16 PM.. Reason: Slash before bin

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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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