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Full Discussion: Need help with permissions in bash
Top Forums Shell Programming and Scripting Need help with permissions in bash Post 302453447 by mrflipr on Wednesday 15th of September 2010 09:16:35 AM
Old 09-15-2010
Need help with permissions in bash
I've set up a little script that will read from a text file. So here goes: I put 3 users in the text file, matt, luke, and rick. I created a group called members and added all 3 users to that group. What I need to know is how do I set permissions for each user to access their own files and directories and not each others. Last, I need another user (jones) from the outside that's not in the group to be able to read all 3 users files and directories, but the users cannot view his. The code I have is this:
#!/bin/bash

CURRENTUSERS=`awk -F":" '{ print $1 }' /etc/passwd`
EXPECTEDUSERS=`cat users.txt`
USERFOUND=0
for i in $EXPECTEDUSERS ; do
for x in $CURRENTUSERS ; do
if [ "$x" = "$i" ] ; then
USERFOUND=1
fi
done
if [ $USERFOUND -eq 1 ] ; then
echo Found user: $i
USERFOUND=0
else
useradd -m /home/$i
echo Adding user: $i
sed s/$i:.*:.*:.*:.*:.*:.*:.*:/$i:XOHWcSkDQKZaA:14208:0:99999:7:::/g </etc/shadow>/etc/shadow2
cp /etc/shadow2 /etc/shadow
rm /etc/shadow2
fi

done
exit 0
Let me know if I'm missing anything or if this is right or not. Thanks
Last edited by mrflipr; 09-15-2010 at 10:20 AM.. Reason: left out info
 

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LEARN ABOUT PHP

gshadow

GSHADOW(5)						   File Formats and Conversions 						GSHADOW(5)

NAME

       gshadow - shadowed group file

DESCRIPTION

       /etc/gshadow contains the shadowed information for group accounts.

       This file must not be readable by regular users if password security is to be maintained.

       Each line of this file contains the following colon-separated fields:

       group name
	   It must be a valid group name, which exist on the system.

       encrypted password
	   Refer to crypt(3) for details on how this string is interpreted.

	   If the password field contains some string that is not a valid result of crypt(3), for instance ! or *, users will not be able to use a
	   unix password to access the group (but group members do not need the password).

	   The password is used when a user who is not a member of the group wants to gain the permissions of this group (see newgrp(1)).

	   This field may be empty, in which case only the group members can gain the group permissions.

	   A password field which starts with an exclamation mark means that the password is locked. The remaining characters on the line
	   represent the password field before the password was locked.

	   This password supersedes any password specified in /etc/group.

       administrators
	   It must be a comma-separated list of user names.

	   Administrators can change the password or the members of the group.

	   Administrators also have the same permissions as the members (see below).

       members
	   It must be a comma-separated list of user names.

	   Members can access the group without being prompted for a password.

	   You should use the same list of users as in /etc/group.

FILES

       /etc/group
	   Group account information.

       /etc/gshadow
	   Secure group account information.

SEE ALSO

       gpasswd(5), group(5), grpck(8), grpconv(8), newgrp(1).

shadow-utils 4.5						    01/25/2018								GSHADOW(5)
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