12-12-2008
Quote:
does anyone know how to write a script that will change file permissions. because the Admin blocked me from altering any of my files im only allowed to read and i heard a script like this can bypass it but i dont know how to write it.
This seems to me like a violation, sorry if I have not understood that properly. Why should an admin block access, any reason behind that?
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LEARN ABOUT CENTOS
scsi_ch_swp
SCSI_CH_SWP(8) SDPARM SCSI_CH_SWP(8)
NAME
scsi_ch_swp - change SCSI Software WRITE Protect and block device settings
SYNOPSIS
scsi_ch_swp [--help] [--set 0|1] [--verbose] [--wr] BLK_DEVICE
DESCRIPTION
This bash shell script attempts to read or change the Software Write Protect (SWP) bit in the SCSI Control mode page using the sdparm util-
ity. If that change is successful then it uses the blockdev utility to change BLK_DEVICE's read-write or read-only setting in sympathy.
This script is only available in Linux since the blockdev utility is Linux specific.
If changing the SWP bit is supported, setting the SWP bit makes BLK_DEVICE read-only at the device (disk) itself. Clearing the SWP bit
makes BLK_DEVICE read-write which is usually the default setting at device (disk) power up.
If no options are given then the current state of the SWP bit is printed out (using sdparm) together with blockdev's RO bit. If they are
both 1 then BLK_DEVICE is in read-only mode; if they are both 0 then BLK_DEVICE is in read-write mode.
OPTIONS
Arguments to long options are mandatory for short options as well.
-h, --help
print out the usage message then exit.
-s, --set 0|1
when 0 is given then the SWP bit in the Control mode page is cleared (i.e. set that bit to 0) using sdparm; and blockdev is used to
set BLK_DEVICE to read-write mode. When 1 is given then the SWP bit in the Control mode page is set using sdparm; and blockdev is
used to set BLK_DEVICE to read-only mode. The default (i.e. when this option is not given) is to read the state of the SWP bit and
BLK_DEVICE's read-only mode and print those values out.
-v, --verbose
increase level or verbosity.
-w, --wr
when the BLK_DEVICE is in read-only mode, Linux will not typically allow BLK_DEVICE to be opened read-write by sdparm, so the
default action of this script is to use the sdparm --readonly option when --set 0 has been invoked. It is possible that BLK_DEVICE
could be a generic device (e.g. /dev/sg3) which has a different interpretation of the read-only open flag and may fail. For such
rare cases the --wr option makes sdparm open BLK_DEVICE read-write when --set 0 is invoked.
EXIT STATUS
The exit status of this script is 0 when it is successful. Otherwise the exit status is that of the sdparm or the blockdev utility, which-
ever is called last. See the sdparm(8) man page.
AUTHORS
Written by D. Gilbert
COPYRIGHT
Copyright (C) 2013 Douglas Gilbert
This software is distributed under a FreeBSD license. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR-
POSE.
SEE ALSO
sdparm(sdparm), blockdev(8)
sdparm-1.08 May 2013 SCSI_CH_SWP(8)