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UNIX for Dummies Questions & Answers
question about groups
Post 9608 by guru on Tuesday 30th of October 2001 10:17:29 PM
10-30-2001
1) if you are on a solaris box you can just use the command groupadd. if you dont have groupadd you can just add it to the file /etc/group. the format will be something like this:
root::0:john, where root is the group name, 0 is the GID (group ID) and john is a user in the group root. you can add more users separated by commas. e.g. root::0:john,mike,jennifer
2) to delete a file that starts with a '-', or any other special character, just do rm ./-filename. to do this you have to be in the same directory as the file. or if you are in let's say /etc and the file is in /root and the filename is '-file' . you would do this: rm /root/-file .
3) to login as a different user, use the command su (switch user) username. e.g. 'su john'. to have john's preferences you would use 'su - john'. if you just type su it will ask you for the root password, because root is the default username for the su command.
root::0:john, where root is the group name, 0 is the GID (group ID) and john is a user in the group root. you can add more users separated by commas. e.g. root::0:john,mike,jennifer
2) to delete a file that starts with a '-', or any other special character, just do rm ./-filename. to do this you have to be in the same directory as the file. or if you are in let's say /etc and the file is in /root and the filename is '-file' . you would do this: rm /root/-file .
3) to login as a different user, use the command su (switch user) username. e.g. 'su john'. to have john's preferences you would use 'su - john'. if you just type su it will ask you for the root password, because root is the default username for the su command.
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LEARN ABOUT LINUX
login.access
LOGIN.ACCESS(5) BSD File Formats Manual LOGIN.ACCESS(5) NAME
login.access -- login access control table DESCRIPTION
The login.access file specifies on which ttys or from which hosts certain users are allowed to login. At login, the /etc/login.access file is checked for the first entry that matches a specific user/host or user/tty combination. That entry can either allow or deny login access to that user. Each entry have three fields separated by colon: o The first field indicates the permission given if the entry matches. It can be either ``+'' (allow access) or ``-'' (deny access) . o The second field is a comma separated list of users or groups for which the current entry applies. NIS netgroups can used (if configured) if preceeded by @. The magic string ALL matches all users. A group will match if the user is a member of that group, or it is the user's primary group. o The third field is a list of ttys, or network names. A network name can be either a hostname, a domain (indicated by a starting period), or a netgroup. As with the user list, ALL matches anything. LOCAL matches a string not containing a period. If the string EXCEPT is found in either the user or from list, the rest of the list are exceptions to the list before EXCEPT. BUGS
If there's a user and a group with the same name, there is no way to make the group match if the user also matches. SEE ALSO
login(1) AUTHORS
The login_access() function was written by Wietse Venema. This manual page was written for Heimdal. HEIMDAL March 21, 2003 HEIMDAL