file_upload Perl Script
The
PHP code I had been using
to upload files to a website would not allow
me to upload files more than a few MB in size, likely due to the
MAX_FILE_SIZE setting for HTTP_POST_VARS. I decided I would use a
Perl script, instead, for
uploading files to the site.
I used a Perl script
Uploading Files Using CGI and Perl Article written by Matt Doyle as
the basis for my script with just some minor modifications. I changed the
maximum allowed size for uploaded files from 5 MB to 15 MB. I also eliminated
the code pertaining to the uploader's email address, since I didn't need
that information, and removed all references to photos in the code, since
I wanted to use the script for uploading any type of file not just photos.
I added some code to provide file size information on the uploaded file when
the upload completes, which I got from
How do I display filesizes in a nice way? at
Stuart's Useful Perl Pages.
When a file is uploaded, the script will now show something like the
following when the upload is completed.
File upload completed!
File uploaded: opera-10.11.gcc4-static-qt3.pkg.gz
File size: 14.43 MB (15136905 bytes)
The Perl script, file_upload.cgi is available
here
References:
-
Uploading Files Using CGI and Perl Article
By: Matt Doyle
Date: March 14, 2008
SitePoint >> Web Design, Web
Development, Freelancing, Tech News and more
-
How do I display filesizes in a nice way?
Stuart's Useful Perl Pages
-
How to get the size of a file in Perl using file test operators.
Perl Programming & Tutorials from
About.com
[/languages/perl]
permanent link
Determining the Network Interface Card (NIC) in a Linux System with lspci
I found that a
network interface card (NIC) in a system was not picking up an
IP via
DHCP. When I checked the
IP configuration for the card,
I saw it had an invalid
MAC address of all zeros.
$ ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:19 Base address:0xdead
The system had an Ethernet controller built into the motherboard. In such
cases you can determing what Ethernet controller is being used by opening
the system case or you can use the lspci command.
$ lspci | grep Ethernet
00:04.0 Ethernet controller: Silicon Integrated Systems [SiS] 190 Ethernet Adapt
er
On Linux systems, the lspi command displays information about
Peripheral
Component Interconnect (PCI) buses in the system and devices connected to
them.
In the above case I could see that the system needed a Linux driver for
a SiS 190 Ethernet Adapter.
NAME
lspci - list all PCI devices
SYNOPSIS
lspci [options]
DESCRIPTION
lspci is a utility for displaying information about PCI buses in the
system and devices connected to them.
By default, it shows a brief list of devices. Use the options described
below to request either a more verbose output or output intended for
parsing by other programs.
If you are going to report bugs in PCI device drivers or in lspci
itself, please include output of "lspci -vvx" or even better "lspci
-vvxxx" (however, see below for possible caveats).
Some parts of the output, especially in the highly verbose modes, are
probably intelligible only to experienced PCI hackers. For exact defi
nitions of the fields, please consult either the PCI specifications or
the header.h and /usr/include/linux/pci.h include files.
Access to some parts of the PCI configuration space is restricted to
root on many operating systems, so the features of lspci available to
normal users are limited. However, lspci tries its best to display as
much as available and mark all other information with <access denied>
text.
OPTIONS
Basic display modes
-m Dump PCI device data in a backward-compatible machine readable
form. See below for details.
-mm Dump PCI device data in a machine readable form for easy parsing
by scripts. See below for details.
-t Show a tree-like diagram containing all buses, bridges, devices
and connections between them.
Display options
-v Be verbose and display detailed information about all devices.
-vv Be very verbose and display more details. This level includes
everything deemed useful.
-vvv Be even more verbose and display everything we are able to
parse, even if it doesn't look interesting at all (e.g., unde
fined memory regions).
-k Show kernel drivers handling each device and also kernel modules
capable of handling it. Turned on by default when -v is given
in the normal mode of output. (Currently works only on Linux
with kernel 2.6 or newer.)
-x Show hexadecimal dump of the standard part of the configuration
space (the first 64 bytes or 128 bytes for CardBus bridges).
-xxx Show hexadecimal dump of the whole PCI configuration space. It
is available only to root as several PCI devices crash when you
try to read some parts of the config space (this behavior proba
bly doesn't violate the PCI standard, but it's at least very
stupid). However, such devices are rare, so you needn't worry
much.
-xxxx Show hexadecimal dump of the extended (4096-byte) PCI configura
tion space available on PCI-X 2.0 and PCI Express buses.
-b Bus-centric view. Show all IRQ numbers and addresses as seen by
the cards on the PCI bus instead of as seen by the kernel.
-D Always show PCI domain numbers. By default, lspci suppresses
them on machines which have only domain 0.
Options to control resolving ID's to names
-n Show PCI vendor and device codes as numbers instead of looking
them up in the PCI ID list.
-nn Show PCI vendor and device codes as both numbers and names.
-q Use DNS to query the central PCI ID database if a device is not
found in the local pci.ids file. If the DNS query succeeds, the
result is cached in ~/.pciids-cache and it is recognized in sub
sequent runs even if -q is not given any more. Please use this
switch inside automated scripts only with caution to avoid over
loading the database servers.
-qq Same as -q, but the local cache is reset.
-Q Query the central database even for entries which are recognized
locally. Use this if you suspect that the displayed entry is
wrong.
Options for selection of devices
-s [[[[<domain>]:]<bus>]:][<slot>][.[<func>]]
Show only devices in the specified domain (in case your machine
has several host bridges, they can either share a common bus
number space or each of them can address a PCI domain of its
own; domains are numbered from 0 to ffff), bus (0 to ff), slot
(0 to 1f) and function (0 to 7). Each component of the device
address can be omitted or set to "*", both meaning "any value".
All numbers are hexadecimal. E.g., "0:" means all devices on
bus 0, "0" means all functions of device 0 on any bus, "0.3"
selects third function of device 0 on all buses and ".4" shows
only the fourth function of each device.
-d [<vendor>]:[<device>]
Show only devices with specified vendor and device ID. Both ID's
are given in hexadecimal and may be omitted or given as "*",
both meaning "any value".
Other options
-i <file>
Use <file> as the PCI ID list instead of
/usr/share/misc/pci.ids.
-p <file>
Use <file> as the map of PCI ID's handled by kernel modules. By
default, lspci uses /lib/modules/kernel_version/modules.pcimap.
Applies only to Linux systems with recent enough module tools.
-M Invoke bus mapping mode which performs a thorough scan of all
PCI devices, including those behind misconfigured bridges, etc.
This option gives meaningful results only with a direct hardware
access mode, which usually requires root privileges. Please
note that the bus mapper only scans PCI domain 0.
--version
Shows lspci version. This option should be used stand-alone.
PCI access options
The PCI utilities use the PCI library to talk to PCI devices (see
pcilib(7) for details). You can use the following options to influence
its behavior:
-A <method>
The library supports a variety of methods to access the PCI
hardware. By default, it uses the first access method avail
able, but you can use this option to override this decision. See
-A help for a list of available methods and their descriptions.
-O <param>=<value>
The behavior of the library is controlled by several named
parameters. This option allows to set the value of any of the
parameters. Use -O help for a list of known parameters and their
default values.
-H1 Use direct hardware access via Intel configuration mechanism 1.
(This is a shorthand for -A intel-conf1.)
-H2 Use direct hardware access via Intel configuration mechanism 2.
(This is a shorthand for -A intel-conf2.)
-F <file>
Instead of accessing real hardware, read the list of devices and
values of their configuration registers from the given file pro
duced by an earlier run of lspci -x. This is very useful for
analysis of user-supplied bug reports, because you can display
the hardware configuration in any way you want without disturb
ing the user with requests for more dumps.
-G Increase debug level of the library.
MACHINE READABLE OUTPUT
If you intend to process the output of lspci automatically, please use
one of the machine-readable output formats (-m, -vm, -vmm) described in
this section. All other formats are likely to change between versions
of lspci.
All numbers are always printed in hexadecimal. If you want to process
numeric ID's instead of names, please add the -n switch.
Simple format (-m)
In the simple format, each device is described on a single line, which
is formatted as parameters suitable for passing to a shell script,
i.e., values separated by whitespaces, quoted and escaped if necessary.
Some of the arguments are positional: slot, class, vendor name, device
name, subsystem vendor name and subsystem name (the last two are empty
if the device has no subsystem); the remaining arguments are option-
like:
-rrev Revision number.
-pprogif
Programming interface.
The relative order of positional arguments and options is undefined.
New options can be added in future versions, but they will always have
a single argument not separated from the option by any spaces, so they
can be easily ignored if not recognized.
Verbose format (-vmm)
The verbose output is a sequence of records separated by blank lines.
Each record describes a single device by a sequence of lines, each line
containing a single `tag: value' pair. The tag and the value are sepa
rated by a single tab character. Neither the records nor the lines
within a record are in any particular order. Tags are case-sensitive.
The following tags are defined:
Slot The name of the slot where the device resides
([domain:]bus:device.function). This tag is always the first in
a record.
Class Name of the class.
Vendor Name of the vendor.
Device Name of the device.
SVendor
Name of the subsystem vendor (optional).
SDevice
Name of the subsystem (optional).
PhySlot
The physical slot where the device resides (optional, Linux
only).
Rev Revision number (optional).
ProgIf Programming interface (optional).
Driver Kernel driver currently handling the device (optional, Linux
only).
Module Kernel module reporting that it is capable of handling the
device (optional, Linux only).
New tags can be added in future versions, so you should silently ignore
any tags you don't recognize.
Backward-compatible verbose format (-vm)
In this mode, lspci tries to be perfectly compatible with its old ver
sions. It's almost the same as the regular verbose format, but the
Device tag is used for both the slot and the device name, so it occurs
twice in a single record. Please avoid using this format in any new
code.
FILES
/usr/share/misc/pci.ids
A list of all known PCI ID's (vendors, devices, classes and sub
classes). Maintained at http://pciids.sourceforge.net/, use the
update-pciids utility to download the most recent version.
/usr/share/misc/pci.ids.gz
If lspci is compiled with support for compression, this file is
tried before pci.ids.
~/.pciids-cache
All ID's found in the DNS query mode are cached in this file.
BUGS
Sometimes, lspci is not able to decode the configuration registers com
pletely. This usually happens when not enough documentation was avail
able to the authors. In such cases, it at least prints the mark to
signal that there is potentially something more to say. If you know the
details, patches will be of course welcome.
Access to the extended configuration space is currently supported only
by the linux_sysfs back-end.
SEE ALSO
setpci(8), update-pciids(8), pcilib(7)
AUTHOR
The PCI Utilities are maintained by Martin Mares <mj@ucw.cz>.
pciutils-3.1.7 31 January 2010 lspci(8)
[/os/unix/commands]
permanent link
Mounting a USB Drive on a Linux System from the Command Line
If you need to manually mount a USB external drive, such as a flash
drive, from the command line, i.e., a shell prompt,
log into the root account for the system then issue the
dmesg
command feeding its results to
grep and then use
tail
to get just the last line containing the word "SCSI", since if you just
plugged the device into the system, that last line likely contains the relevant
entry.
$ su - root
Password:
# dmesg | grep -i 'SCSI device' | tail --lines=1
SCSI device sdb: 7813120 512-byte hdwr sectors (4000 MB)
Since I know the flash drive I plugged into the system in this case is
a 4 GB drive, I know that sdb is indeed the relevant drive
designator.
Alternatively you could look for the information in /var/log/messages
.
[root@example ~]# grep SCSI /var/log/messages | tail --lines=1
Nov 13 09:55:55 example kernel: SCSI device sdb: 7813120 512-byte hdwr secto
rs (4000 MB)
You can then use the information you obtained for the drive designator,
in this case sdb to mount the drive. Note you might see other
"sd" designators, such as sda, sdc, sdd, etc., or "hd" designators, such as
hda, hdb, hdc, etc.
Use the mount command to mount the drive to an
exising mount point, such as one beneath /mnt or
/media. Unless a directory already exists that you
wish to use, you could create a directory which you will use to
access the contents of the USB drive. Let's suppose you want to use
myusb for that directory; you then need to create the
directory.
Presuming the file system on the flash drive is vfat, I could use the
command below to mount the device at the mount point /media/myusb.
You need to spcify the file system type with the -t option.
Note: I use sdb1 rather than just the designator sdb,
since I want to mount the first and, in this case, only partition, on the
flash drive. The
VFAT file system is a commonly used one for flash and other USB drives. It
is a Microsoft created file system that allows the use of file names longer
than an 8 character file name with a 3 character extension.
[root@example ~]# mount -t vfat /dev/sdb1 /media/myusb
I can then issue the mount command again without any parameters
to verify the drive is mounted.
[root@example ~]# mount | grep sdb
/dev/sdb1 on /media/myusb type vfat (rw)
The rw on the output shows me that the drive is mounted
in read/write mode rather than read only (ro) mode, so I could write to
the drive as well as read from it.
You should then be able to access the drive using /media/myusb,
or whatever you used for the path designator.
[root@frostdragon ~]# ls /media/myusb
aoss.txt definitions
When you are finished with the drive, you should unmount it using the
umount command prior to removing it from the system. You can
also remove the directory you created for mounting it using the rmdir
command, unless you will use that same directory for mounting it or
other drives in the future.
[root@example ~]# umount /media/myusb
[root@example ~]# rmdir /media/myusb
References:
-
VFAT
Wikipedia, the free encyclopedia
-
How to Mount USB flash drive from Command Line
Date: December 1, 2007
Linux Commando
[/os/unix/linux]
permanent link
lsusb
To see a list of all USB devices connected to a Linux computer, use the
lsusb command.
# lsusb
Bus 005 Device 001: ID 0000:0000
Bus 002 Device 001: ID 0000:0000
Bus 004 Device 001: ID 0000:0000
Bus 001 Device 002: ID 0781:5530 SanDisk Corp.
Bus 001 Device 001: ID 0000:0000
Bus 003 Device 001: ID 0000:0000
Note: if you type lsusb and get a "command not found" message,
the command may not be in your path. It may be in /sbin, so
try specifying the path /sbin/lsusb.
To see more details on the USB devices attached to the system, use
lsusb -v. If you don't specify a particular device you
are interested in, you will get quite a bit of information. To restrict
the information to a particular device, e.g., the SanDisk flash drive
in the list above, you can specify a device and bus number, e.g., bus 001
and device number 002 in the above case, using the -s option.
# lsusb -v -s 1:2
Bus 001 Device 002: ID 0781:5530 SanDisk Corp.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0781 SanDisk Corp.
idProduct 0x5530
bcdDevice 1.00
iManufacturer 1
iProduct 2
iSerial 3
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
MaxPower 200mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk (Zip)
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 1
can't get device qualifier: Connection timed out
can't get debug descriptor: Connection timed outIf you move the USB device to another USB port on the system, you will
see the bus number and device number combination change.
# lsusb
Bus 005 Device 001: ID 0000:0000
Bus 002 Device 001: ID 0000:0000
Bus 004 Device 001: ID 0000:0000
Bus 001 Device 007: ID 0781:5530 SanDisk Corp.
Bus 001 Device 001: ID 0000:0000
Bus 003 Device 001: ID 0000:0000
The full list of options for the command is shown below.
# lsusb -h
lsusb: invalid option -- h
Usage: lsusb [options]...
List USB devices
-v, --verbose
Increase verbosity (show descriptors)
-s [[bus]:][devnum]
Show only devices with specified device and/or
bus numbers (in decimal)
-d vendor:[product]
Show only devices with the specified vendor and
product ID numbers (in hexadecimal)
-D device
Selects which device lsusb will examine
-t
Dump the physical USB device hierarchy as a tree
-V, --version
Show version of programReferences:
-
Linux / Unix Command: lsusb
Linux Operating System and Linux Distributions
[/os/unix/commands]
permanent link
PC Tools Alternate Opeating System Scanner (AOSS) version 2.0.5
PC Tools free
Alternate Operating System Scanner allows you to boot a Microsoft
Windows system with an alternate operating system on a CD. You can then
scan the system for viruses from the CD, though I've found the utilitity
of its anti-virus scanner to be very limited.
When I tried the virus scanning feature on a Dell Dimension 4550 PC that
had Windows XP Home installed on the hard drive, the scanner didn't seem to be
very effective, completing the scan in only 8 seconds and checking only
738 files out of the hundreds of thousands of files that existed on the
Windows partition of the hard drive I scanned.
| Total malware files: | 0 |
| Total files: | 738 |
| Scan time: | 8 seconds |
The CD comes with a file manager that will allow you to access directories
and files on your Microsoft Windows partitions on the hard drive.
It also has "Disk Detonator", which will allow you to destroy partitions
on the hard drive, if you wish.
You can get a
shell prompt by choosing "System Shell" from the main menu, which will
give you an ash shell
provided via BusyBox, but
the AOSS CD is lacking in standard Linux command line utilities.
There is no scp nor ftp for transferring files over the network to another
system. There is no links nor lynx one might use to access a web server to
download or upload files. Wget and curl are also missing as are the standard
network utilities such as ifconfig and netstat.
When I checked the contents of /proc/version, I saw that
AOSS uses Ubuntu GNU/Linux for the
operating system.
Linux version 2.6.39.4 (www-data@steve-aoss-ubuntu) (gcc version 4.4.1 (Ubuntu 4
.4.1-4ubuntu9) ) #1 SMP PREEMPT Mon Oct 31 11:26:05 EST 2011
References:
-
Bootable Antivirus and AntiSpyware Software AOSS | PC Tools
Free AntiVirus & AntiSpyware Software | PC Tools
-
PC Tools Alternative Operating System AOS Freware Virus Scanner
Date: May 27, 2010
Free Antivirus Help Blog |
Your source for the latest antivirus news and antivirus reviews
[/security/antivirus/pctools]
permanent link
