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Shell Programming and Scripting

File permissions for particular user

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# 1  
Old 08-06-2012
Question File permissions for particular user
Hi,

How can we assign file permissions for a purticular user, rather than giving to whole group.


Thanks.
# 2  
Old 08-06-2012
Check out the chmod(1) man page. Without any indication of what permissions you want for "the file's owner", "members of the file's group", and "everyone else" it is hard to give much more in the way of a suggestion.
# 3  
Old 08-06-2012
Question
I have a file abc.txt and have to give Full permissions to a User John, who is in sxy group. But the permissions won't have to be applicable to whole sxy group users.
# 4  
Old 08-06-2012
What type of file. (Does John need to execute it [if it is a regular file], search it [if it is a directory]? What permissions to you want to grant to members of group sxy other than John? What permissions do you want to grant to users who are non John and are not in group say? Am I correct in assuming that the file in question is owned by John?
# 5  
Old 08-06-2012
Perhaps you should take a look at Access Control Lists?

Code:
$ echo Hello > somefile
$ ls -le somefile
-rw-r--r--  1 scott  staff  6  6 Aug 21:40 somefile
$ chmod 600 somefile
$ ls -le somefile
-rw-------  1 scott  staff  6  6 Aug 21:40 somefile
$ su oracle
Password:
bash-3.2$ cat somefile
cat: somefile: Permission denied
bash-3.2$ exit
$ chmod +a "oracle allow read" somefile
$ ls -al somefile
-rw-------+ 1 scott  staff  6  6 Aug 21:40 somefile
$ su oracle  
Password:
bash-3.2$ cat somefile
Hello
bash-3.2$ exit
$ su testuser
Password:
bash-3.2$ cat somefile
cat: somefile: Permission denied

How / if you implement this may vary on which OS you are using.
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