Hello, I am very new to shell scripting. This problem seems quite easy so it should be quite easy (I hope ^^)
I want to get a random file from a directory. this file will be in one subdirectory, and it will contain spaces.
code I have got so far:
N=find ./*/*.jpg | wc -l
((N=RANDOM%N))
... (6 Replies)
My problem is as follow and i hope you can help:
I currently have this function:
stored_word()
{
number=$RANDOM
let "number %= 21"
case $number in
0 ) echo "energy" ;; 1 ) echo "touch" ;;
2 ) echo "climbing" ;; 3 ) echo "declare" ;;
4 ) echo "marry" ;; 5 ) echo "relax" ... (8 Replies)
Hi there folks,
for an exercise for my pupils (you know i am always thinking of them!) i need to randomly re-arrange the words (blank space separated) in a sentence (a line in a textfile). Any inspiration??
Txk so much. (9 Replies)
Hi
I am new to expect. Please if any one can help on my issue its really appreciable. here is my issue:
I want expect script for random passwords and random commands generation.
please can anyone help me?
Many Thanks in advance (0 Replies)
Over the last month or so my CentOS server has been crashing for reasons I do not know. It has been running for over a year with regular yum updates without problems. The load on the server is perfectly normal with CPU usage at 5-6% and RAM usage at less than half of 32GB of RAM (multiple smaller... (3 Replies)
Hi,
Could you please let me know what the following code does, I know that it means generating random numbers, however not sure what is the entire purpose.
R=$(($RANDOM % 2))
delay=$(($RANDOM % 10))
if
then
TEXT='X'
else
... (3 Replies)
Need to use dd to generate a large file from a sample file of random data. This is because I don't have /dev/urandom.
I create a named pipe then:
dd if=mynamed.fifo do=myfile.fifo bs=1024 count=1024
but when I cat a file to the fifo that's 1024 random bytes:
cat randomfile.txt >... (7 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
Write a shell script that will take the sum of two random number?
Ex: Random n1 +Random n2 = result
i tries to write it but i had some dufficulties
... (3 Replies)
Discussion started by: renegade755
3 Replies
LEARN ABOUT OSX
random
RANDOM(4) BSD Kernel Interfaces Manual RANDOM(4)NAME
random , urandom -- random data source devices.
SYNOPSIS
pseudo-device random
DESCRIPTION
The random device produces uniformly distributed random byte values of potentially high quality.
To obtain random bytes, open /dev/random for reading and read from it.
To add entropy to the random generation system, open /dev/random for writing and write data that you believe to be somehow random.
/dev/urandom is a compatibility nod to Linux. On Linux, /dev/urandom will produce lower quality output if the entropy pool drains, while
/dev/random will prefer to block and wait for additional entropy to be collected. With Yarrow, this choice and distinction is not necessary,
and the two devices behave identically. You may use either.
OPERATION
The random device implements the Yarrow pseudo random number generator algorithm and maintains its entropy pool. Additional entropy is fed
to the generator regularly by the SecurityServer daemon from random jitter measurements of the kernel. SecurityServer is also responsible
for periodically saving some entropy to disk and reloading it during startup to provide entropy in early system operation.
You may feed additional entropy to the generator by writing it to the random device, though this is not required in a normal operating envi-
ronment.
LIMITATIONS AND WARNINGS
Yarrow is a fairly resilient algorithm, and is believed to be resistant to non-root. The quality of its output is however dependent on regu-
lar addition of appropriate entropy. If the SecurityServer system daemon fails for any reason, output quality will suffer over time without
any explicit indication from the random device itself.
Paranoid programmers can counteract this risk somewhat by collecting entropy of their choice (e.g. from keystroke or mouse timings) and seed-
ing it into random directly before obtaining important random numbers.
FILES
/dev/random
/dev/urandom
HISTORY
A random device appeared in the Linux operating system.
Darwin September 6, 2001 Darwin