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UNIX for Dummies Questions & Answers
managing users
Post 21 by Neo on Wednesday 20th of September 2000 02:17:19 PM
09-20-2000
Administrator
OK. The actual commands and flags depend on the flavor of UNIX you are playing on (YMMV):
In Linux you add users with the 'adduser' command.
After adding users, you create a group by editing the
/etc/group file and add users to the group. I use the
VI editor.
Now you have users and groups
.
The permissions are based on your different requirements.
Lets say you want the new users to write in the directory
but no modify it.
mkdir /tmp/newdirectory
chown root.newgroup /tmp/newdirectory
chmod 770 /tmp/newdirectory
This means that root will be able to read, write, and search; members of the newgroup will be able to do the
same. Other users and groups will have no permissions
to write, search or read the directory.
It is best, IMHO, for you to read the man pages on chown()
and chmod() and then experiment by changing to different
users (to get a flavor for how it actually works.)
In Linux you add users with the 'adduser' command.
After adding users, you create a group by editing the
/etc/group file and add users to the group. I use the
VI editor.
Now you have users and groups
.The permissions are based on your different requirements.
Lets say you want the new users to write in the directory
but no modify it.
mkdir /tmp/newdirectory
chown root.newgroup /tmp/newdirectory
chmod 770 /tmp/newdirectory
This means that root will be able to read, write, and search; members of the newgroup will be able to do the
same. Other users and groups will have no permissions
to write, search or read the directory.
It is best, IMHO, for you to read the man pages on chown()
and chmod() and then experiment by changing to different
users (to get a flavor for how it actually works.)
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LEARN ABOUT DEBIAN
vigr
VIPW(8) System Management Commands VIPW(8) NAME
vipw, vigr - edit the password, group, shadow-password or shadow-group file SYNOPSIS
vipw [options] vigr [options] DESCRIPTION
The vipw and vigr commands edits the files /etc/passwd and /etc/group, respectively. With the -s flag, they will edit the shadow versions of those files, /etc/shadow and /etc/gshadow, respectively. The programs will set the appropriate locks to prevent file corruption. When looking for an editor, the programs will first try the environment variable $VISUAL, then the environment variable $EDITOR, and finally the default editor, vi(1). OPTIONS
The options which apply to the vipw and vigr commands are: -g, --group Edit group database. -h, --help Display help message and exit. -p, --passwd Edit passwd database. -q, --quiet Quiet mode. -R, --root CHROOT_DIR Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory. -s, --shadow Edit shadow or gshadow database. ENVIRONMENT
VISUAL Editor to be used. EDITOR Editor to be used if VISUAL is not set. FILES
/etc/group Group account information. /etc/gshadow Secure group account information. /etc/passwd User account information. /etc/shadow Secure user account information. SEE ALSO
vi(1), group(5), gshadow(5) , passwd(5), , shadow(5). shadow-utils 4.1.5.1 05/25/2012 VIPW(8)