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Full Discussion: Re-apply the file permission
Top Forums Shell Programming and Scripting Re-apply the file permission Post 302445029 by agent001 on Friday 13th of August 2010 12:28:00 PM
Old 08-13-2010
Re-apply the file permission
Hi, I having an issue with file permission. To fix it I need to read the file's existing permission and re-apply the same permission to the file. This has to be done for every single file under a mount point. I'm novice in scripting. Help me with this in shell scripting.

Code:
# ls -l /dev/null
lrwxrwxrwx   1 root     other         27 Nov  4  2005 /dev/null -> ../devices/pseudo/mm@0:null
# ls -l /devices/pseudo/mm@0:null
crw-rw-rw-   1 root     sys       13,  2 Aug  9 19:04 /devices/pseudo/mm@0:null

#chmod a+rwx /dev/null
#chmod ug0+rw /devices/pseudo/mm@0:null

 

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LEARN ABOUT X11R4

pty

PTY(4)                                                     BSD Kernel Interfaces Manual                                                     PTY(4)

NAME

     pty -- BSD-style compatibility pseudo-terminal driver

SYNOPSIS

     device pty

DESCRIPTION

     The pty driver provides support for the traditional BSD naming scheme that was used for accessing pseudo-terminals.  When the device
     /dev/ptyXX is being opened, a new terminal shall be created with the pts(4) driver.  A device node for this terminal shall be created, which
     has the name /dev/ttyXX.

     New code should not try to allocate pseudo-terminals using this interface.  It is only provided for compatibility with older C libraries that
     tried to open such devices when posix_openpt(2) was being called.

FILES

     The BSD-style compatibility pseudo-terminal driver uses the following device names:

     /dev/pty[l-sL-S][0-9a-v]  Pseudo-terminal master devices.

     /dev/tty[l-sL-S][0-9a-v]  Pseudo-terminal slave devices.

DIAGNOSTICS

     None.

SEE ALSO

     posix_openpt(2), pts(4), tty(4)

HISTORY

     A pseudo-terminal driver appeared in 4.2BSD.

BUGS

     Unlike previous implementations, the master slave device nodes are destroyed when the PTY becomes unused.  A call to stat(2) on a nonexistent
     master device will already cause a new master device node to be created.  The master device can only be destroyed by opening and closing it.

     The pty driver cannot be unloaded, because it cannot determine if it is being used.

BSD                                                               August 20, 2008                                                              BSD
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