Something I have always wondered but never had any luck finding information on is running a shell script when a device mounts...
Lets say I have an external hard drive as a back up, every time I plug the device in I want to launch a shell script to rsync a few directories.
How would I do... (4 Replies)
I just upgraded to Android 2.2 from 2.1. The GPS issue that was troublesome in 2.1 seems to have been fixed. Some of web browsing seems faster, but it could just be my connection is better today ;) Flash works in some browsers but not very good and it is too slow for Flash apps designed for... (0 Replies)
Hi UNIX-Forum!
I don't know if this is the right Forum for my question, but since Android technically is a UNIX-based system...
I have a rooted Android and a Terminal emulator and bash installed.
I wanted to write a little script for my android that activates GPS, gets the location and sends... (3 Replies)
Hello Gurus,
We are in the process of configuring SAN based backup for our DB hosted on Solaris 10 (SPARC and X86) Servers. But the Robotic arm (Medium Changer - HP) is not getting detected on the server.
Need experts help in checking this from the host (Solaris Server) end.
Thank You. (0 Replies)
HI all, im new to shell scripting. need your guidence for my script. i wrote one script and is attached here
Im explaining the requirement of script.
AIM: Shell script to run automatically as per scheduled and backup few network devices configurations. Script will contain a set of commands... (4 Replies)
Hi,
I have a program that logs serial port data. In order to do so it requires the full device name in linux (e.g. /dev/ttyUSB0) and a baudrate.
Does anyone know how I can find out the device name in the terminal? I am trying to port this application to Android and cant figure it out.
... (22 Replies)
I am looking for a way to run on top of the Linux kernel of an Android device. I want to use the existing configured Linux beneath Android rather than put a new Linux distribution onto a device.
The article "The Android boot process from power on" (sorry, forum won't let me paste the link)... (0 Replies)
RANDOM(4) Linux Programmer's Manual RANDOM(4)NAME
random, urandom - kernel random number source devices
DESCRIPTION
The character special files /dev/random and /dev/urandom (present since Linux 1.3.30) provide an interface to the kernel's random number
generator. File /dev/random has major device number 1 and minor device number 8. File /dev/urandom has major device number 1 and minor
device number 9.
The random number generator gathers environmental noise from device drivers and other sources into an entropy pool. The generator also
keeps an estimate of the number of bit of the noise in the entropy pool. From this entropy pool random numbers are created.
When read, the /dev/random device will only return random bytes within the estimated number of bits of noise in the entropy pool.
/dev/random should be suitable for uses that need very high quality randomness such as one-time pad or key generation. When the entropy
pool is empty, reads to /dev/random will block until additional environmental noise is gathered.
When read, /dev/urandom device will return as many bytes as are requested. As a result, if there is not sufficient entropy in the entropy
pool, the returned values are theoretically vulnerable to a cryptographic attack on the algorithms used by the driver. Knowledge of how to
do this is not available in the current non-classified literature, but it is theoretically possible that such an attack may exist. If this
is a concern in your application, use /dev/random instead.
CONFIGURING
If your system does not have /dev/random and /dev/urandom created already, they can be created with the following commands:
mknod -m 644 /dev/random c 1 8
mknod -m 644 /dev/urandom c 1 9
chown root:root /dev/random /dev/urandom
When a Linux system starts up without much operator interaction, the entropy pool may be in a fairly predictable state. This reduces the
actual amount of noise in the entropy pool below the estimate. In order to counteract this effect, it helps to carry entropy pool informa-
tion across shut-downs and start-ups. To do this, add the following lines to an appropriate script which is run during the Linux system
start-up sequence:
echo "Initializing kernel random number generator..."
# Initialize kernel random number generator with random seed
# from last shut-down (or start-up) to this start-up. Load and
# then save 512 bytes, which is the size of the entropy pool.
if [ -f /var/random-seed ]; then
cat /var/random-seed >/dev/urandom
fi
dd if=/dev/urandom of=/var/random-seed count=1
Also, add the following lines in an appropriate script which is run during the Linux system shutdown:
# Carry a random seed from shut-down to start-up for the random
# number generator. Save 512 bytes, which is the size of the
# random number generator's entropy pool.
echo "Saving random seed..."
dd if=/dev/urandom of=/var/random-seed count=1
FILES
/dev/random
/dev/urandom
AUTHOR
The kernel's random number generator was written by Theodore Ts'o (tytso@athena.mit.edu).
SEE ALSO
mknod (1)
RFC 1750, "Randomness Recommendations for Security"
Linux 1997-08-01 RANDOM(4)