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Full Discussion: who modified my file!!
Top Forums UNIX for Dummies Questions & Answers who modified my file!! Post 87189 by vijaygoutham on Friday 21st of October 2005 02:17:10 AM
Old 10-21-2005
Unix allows you to give three levels of permissions to the file.
a. Owner
b. Group
c. Others

When we do a ls -lt, the following is a sample output.

-rwxrwxrwx 1 vijay dev 4692060 Oct 13 17:22 core

The above file (core) the owner user is "vijay" and owner group is "dev". (vijay user is part of dev group. also dev group has other users as well).

rwxrwxrwx is the files permissions. The first three 'rwx' corresponds to the 'owner' user. The next three to the 'group' (all users within that group) and the last three is for all others.

So in the above example all (the owner i.e. user vijay, all users belonging to group 'dev' and all others have read, write and execute permissions)

When i change the permission as 'chmod 640 core', the permission becomes 'rw_r_____'. (Note - the owner of the file only can change the permission using chmod)

So now
user 'vijay' has permissions to read and write
all users under group dev have permissions to read
all other users do not have any permissions on the file.


So you can give permissions (if you are the owner) accordingly as to who all (users) can modify the file.

I am not aware of any command in Unix which will give you the user who last edited the file.
 

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CHMOD(1)						      General Commands Manual							  CHMOD(1)

NAME
chmod - change mode SYNOPSIS
chmod mode file ... DESCRIPTION
The mode of each named file is changed according to mode, which may be absolute or symbolic. An absolute mode is an octal number con- structed from the OR of the following modes: 4000 set user ID on execution 2000 set group ID on execution 1000 sticky bit, see chmod(2) 0400 read by owner 0200 write by owner 0100 execute (search in directory) by owner 0070 read, write, execute (search) by group 0007 read, write, execute (search) by others A symbolic mode has the form: [who] op permission [op permission] ... The who part is a combination of the letters u (for user's permissions), g (group) and o (other). The letter a stands for ugo. If who is omitted, the default is a but the setting of the file creation mask (see umask(2)) is taken into account. Op can be + to add permission to the file's mode, - to take away permission and = to assign permission absolutely (all other bits will be reset). Permission is any combination of the letters r (read), w (write), x (execute), s (set owner or group id) and t (save text - sticky). Let- ters u, g or o indicate that permission is to be taken from the current mode. Omitting permission is only useful with = to take away all permissions. The first example denies write permission to others, the second makes a file executable: chmod o-w file chmod +x file Multiple symbolic modes separated by commas may be given. Operations are performed in the order specified. The letter s is only useful with u or g. Only the owner of a file (or the super-user) may change its mode. SEE ALSO
ls(1), chmod(2), chown (1), stat(2), umask(2) CHMOD(1)
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