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Full Discussion: Assigning variable from command outputs to shell
Top Forums Shell Programming and Scripting Assigning variable from command outputs to shell Post 302329445 by staze on Saturday 27th of June 2009 10:10:38 PM
Old 06-27-2009
Assigning variable from command outputs to shell
First, this is bash (3.2.17), on a Mac, 10.5.7.

What I'm trying to do is look at a list of users, and check to see if each exists. If they do, do some more stuff, if they don't, drop them into an error file.

So, my user list is:
foo - exists
bar - does not exist
blah - does not exist

K, so, here's the script:

Code:
#!/bin/bash

#This script will take two arguments, the group name, and the user list. 
#It is recommended that the group be cleared before running this script since
#it will not remove people from the group.

if [ "$#" != "2" ]; then
echo -e "Usage of the groupadd script: $0 groupname userlist\n"
exit 1
else

group="$1"
userlist="$2"

echo "Adding users in $userlist to group $group"

read -p 'Enter username with directory write : ' admin
read -p 'Enter password for user : ' -s password

echo "test user: $admin, test pass: $password"
echo "group: $group, userlist: $userlist"

for user in `cat $userlist`; do
	check=$(id -u $user | grep "no such user")
	if [ $check != NULL ]; then
		echo "blah"
		#echo "User $user does not exist!" 
	fi
done
fi

I am obviously going to do more. The issue is, the output from id ends up outputting to the shell, rather than "blah". So, in the case of bar and blah, I get:
"id: bar: no such user
id: blah: no such user"
output to the shell. Where, I'd THINK that I'd get the output:
"blah
blah"

Anyone got any idea what's wrong?

Thanks!
 

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LEARN ABOUT HPUX

groupmod

groupmod(1M)															      groupmod(1M)

NAME

       groupmod - modify a group on the system

SYNOPSIS

       alternate_password_file] gid name] userlist] group

DESCRIPTION

       The command modifies a group on the system by altering the appropriate entry in the file.

       The  command  must be used with the group argument, which is the name of the group to be modified.  The name consists of a string of print-
       able characters that may not include a colon or newline

       Refer to usergroupname(5) to understand the functionality changes with the Numeric User Group Name feature.

   Options
       The command uses the following options:

	      Specify the path to the alternate password file. When this option is
			specified, user information is looked up in this file, instead of

			If specified, the option should used as the first option.

	      Change the value of the group
			ID to gid.  gid must be a non-negative decimal integer less than as defined in the header file.

	      Allow the gid to be non-unique (that is, a duplicate).

	      Change the name of the group to
			name.  name consists of a string of printable characters that may not include a colon or newline

	      Add	userlist to the supplementary group membership list of group.  It should be used in conjunction with option.

	      Modify the supplementary group membership list of
			group to userlist.  It should be used in conjunction with option.

	      Delete	userlist from the supplementary group membership list of group.  It should be used in conjunction with option.

	      Specifies the list of users for modifying the supplementary
			group membership list of the group.  When options and options are not specified, is assumed.

   NIS
       The command is aware of NIS user entries.  Only local groups may be modified with Attempts to modify an NIS group will result in an  error.
       NIS groups must be administered from the NIS server.  If is used on a system where NIS is installed, it may fail with the error

       (return	value  6) if the group specified is an NIS group (see group(4)).  However, NIS groups are checked when verifying uniqueness of the
       new gid or new group name, which may result in the above error, or the error

       (return value 4).

RETURN VALUE

       The command exits with one of the following values:

	      No error.

	      Invalid command syntax.

	      Invalid argument supplied to an option.

	      gid  is not unique (when is not used).

	      group
		   does not exist.

	      group
		   is not unique.

	      Cannot modify the
		   file.

	      file or
		   file busy. Another command may be modifying the file.

	      Unable to open
		   file or the file is non-existent.

	      Exceeding permissible limit of maximum members in a group.
		   The file is not modified.

EXAMPLES

       Change the group ID of the group to in the file if the group exists.  This is done even if the group ID is already in use.

       Change the name of to in the file if the group does not already exist.

WARNINGS

       Because many users try to write to the file simultaneously, a password locking mechanism was devised.  If this locking fails  after  subse-
       quent retrying, terminates.

FILES

SEE ALSO

       users(1), groupadd(1M), groupdel(1M), logins(1M), useradd(1M), userdel(1M), usermod(1M), group(4), usergroupname(5).

STANDARDS CONFORMANCE

																      groupmod(1M)
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