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Full Discussion: Is there a way to check when the permissions for the file got changed in AIX
Top Forums UNIX for Dummies Questions & Answers Is there a way to check when the permissions for the file got changed in AIX Post 302876395 by wisecracker on Sunday 24th of November 2013 04:54:19 AM
Old 11-24-2013
Hi Vishal_dba...

If you are not sure experiment longhand first, this checks on the fly.
Admittedly it is not AIX but I am sure you can adapt the principle.
OSX 10.7.5, default bash terminal.
Code:
#!/bin/bash --posix
echo "This is a test string..." > /tmp/currentfile
chmod 755 /tmp/currentfile
cp /tmp/fileone /tmp/oldfile
chmod 755 /tmp/oldfile
hold=2
while true
do
	filecurrent=`ls -l /tmp/currentfile`
	fileold=`ls -l /tmp/oldfile`
	if [ "${filecurrent:0:10}" == "${fileold:0:10}" ]
	then
		echo "No change in permissions..."
		: # Do other stuff as required...
		sleep $hold
	else
		echo "Permissions changed..."
		break
	fi
	cp /tmp/currentfile /tmp/oldfile
	# The line below added for this DEMO...
	chmod 744 /tmp/oldfile
done
echo `date`

Results on above machine...
Code:
Last login: Sun Nov 24 09:44:12 on ttys000
AMIGA:barrywalker~> chmod 755 permissions.sh
AMIGA:barrywalker~> ./permissions.sh
No change in permissions...
Permissions changed...
Sun 24 Nov 2013 09:46:43 GMT
AMIGA:barrywalker~> _

 

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LEARN ABOUT DEBIAN

eaccess

EUIDACCESS(3)						     Linux Programmer's Manual						     EUIDACCESS(3)

NAME

       euidaccess, eaccess - check effective user's permissions for a file

SYNOPSIS

       #define _GNU_SOURCE	       /* See feature_test_macros(7) */
       #include <unistd.h>

       int euidaccess(const char *pathname, int mode);
       int eaccess(const char *pathname, int mode);

DESCRIPTION

       Like access(2), euidaccess() checks permissions and existence of the file identified by its argument pathname.  However, whereas access(2),
       performs checks using the real user and group identifiers of the process, euidaccess() uses the effective identifiers.

       mode is a mask consisting of one or more of R_OK, W_OK, X_OK and F_OK, with the same meanings as for access(2).

       eaccess() is a synonym for euidaccess(), provided for compatibility with some other systems.

RETURN VALUE

       On success (all requested permissions granted), zero is returned.  On error (at least one bit in  mode  asked  for  a  permission  that	is
       denied, or some other error occurred), -1 is returned, and errno is set appropriately.

ERRORS

       As for access(2).

VERSIONS

       The eaccess() function was added to glibc in version 2.4.

CONFORMING TO

       These functions are nonstandard.  Some other systems have an eaccess() function.

NOTES

       Warning: Using this function to check a process's permissions on a file before performing some operation based on that information leads to
       race conditions: the file permissions may change between the two steps.	Generally, it is safer just to attempt the desired  operation  and
       handle any permission error that occurs.

       This function always dereferences symbolic links.  If you need to check the permissions on a symbolic link, use faccessat(2) with the flags
       AT_EACCESS and AT_SYMLINK_NOFOLLOW.

SEE ALSO

       access(2), chmod(2), chown(2), faccessat(2), open(2), setgid(2), setuid(2), stat(2), credentials(7), path_resolution(7)

COLOPHON

       This page is part of release 3.44 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

								    2010-11-01							     EUIDACCESS(3)
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