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Full Discussion: changing permissions of a file whos name was passed to 755
Homework and Emergencies Homework & Coursework Questions changing permissions of a file whos name was passed to 755 Post 302398451 by methyl on Wednesday 24th of February 2010 05:02:46 PM
Old 02-24-2010
Some clues to get you started.

If an executable script called "myscript" was invoked from the command line as
Code:
./myscript myfilename 755

we can save the parameters into named environment variables called say filename from $1 and the permissions parameter (755) from $2.

Code:
filename="$1"
echo "The first parameter is: ${filename}"
perms="$2"
echo "The second parameter is: ${perms}"

If we want to find out the current directory listing for the file myfile we can extend the script by one line. Any line starting with a hash character (#) a comment line and will be ignored by the shell.

Code:
filename="$1"
echo "The first parameter is: ${filename}"
perms="$2"
echo "The second parameter is: ${perms}"
# Directory listing for file called myfile
ls -la "${filename}"

Now we understand script parameters, we can take the saved $2 (now called ${perms} ) and substitute it into a unix chmod command.

Your turn!
Last edited by methyl; 02-24-2010 at 06:16 PM.. Reason: After discussion with colleagues decided to put 755 on the command call to point the way.
 

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LEARN ABOUT CENTOS

pam_console_apply

pam_console_apply(8)					   System Administrator's Manual				      pam_console_apply(8)

NAME

       pam_console_apply - set or revoke permissions for users at the system console

SYNOPSIS

       pam_console_apply [-f <fstab file>] [-c <console.perms file>] [-r] [-t <tty>] [-s] [-d] [<device file> ...]

DESCRIPTION

       pam_console_apply is a helper executable which sets or resets permissions on device nodes.
       If  /var/run/console.lock  exists,  pam_console_apply  will grant permissions to the user listed therein.  If the lock file does not exist,
       permissions are reset according to defaults set in console.perms files, normally configured to set permissions on devices so that root owns
       them.

       When  initializing  its	configuration  it first parses the /etc/security/console.perms file and then it searches for files ending with the
       .perms suffix in the /etc/security/console.perms.d directory. These files are parsed in the lexical order in "C" locale.  Permission  rules
       are appended to a global list, console and device class definitions override previous definitions of the same class.

ARGUMENTS

       -c     Load other console.perms file than the default one.

       -f     Load other fstab file than the default one (/etc/fstab).

       -r     Signals  pam_console_apply to reset permissions.	The default is to set permissions so that the user listed in /var/run/console.lock
	      has access to the devices, and to reset permissions if no such file exists.

       -t     Use <tty> to match console class in console.perms file. The default is tty0.

       -s     Write error messages to the system log instead of stderr.

       -d     Log/display messages useful for debugging.

       The optional <device file> arguments constrain what files should be affected by pam_console_apply. If they aren't specified permissions are
       changed on all files specified in the console.perms file.

FILES

       /var/run/console.lock
       /etc/security/console.perms
       /etc/security/console.perms.d/50-default.perms

SEE ALSO

       pam_console(8)
       console.perms(5)

BUGS

       Let's hope not, but if you find any, please report them via the "Bug Track" link at http://bugzilla.redhat.com/bugzilla/

AUTHORS

       Nalin Dahyabhai <nalin@redhat.com>, using code shamelessly stolen from parts of pam_console.
       Support of console.perms.d and other improvements by Tomas Mraz <tmraz@redhat.com>.

Red Hat 							     2005/5/2						      pam_console_apply(8)
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