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Full Discussion: Need specialized random string generator script
Top Forums Shell Programming and Scripting Need specialized random string generator script Post 302486064 by Chubler_XL on Thursday 6th of January 2011 10:35:01 PM
Old 01-06-2011
This does what you asked for (based on BeefStu's great starter).

Code:
#!/bin/ksh
genstr()
{
    # generate a readom string contaning n characters from a supplied
    # list of chars
    #
    # usage: genstr <n> <listchar ...>
    #
    # eg:  genstr 8 0 1 would generate an 8 digit binary number
    #
    LEN=$1
    shift
    set -A CHARS $@
    CNUM="${#CHARS[@]}"
    RANDSTR=""
    let POSCNT=0;
    while true
    do
        [ $POSCNT -ge $LEN ] && break;
        let POSCNT=$POSCNT+1
        RANDSTR="${RANDSTR}${CHARS[${RANDOM}%${CNUM}]}"
    done
    echo "${RANDSTR}"
}
need=$(genstr 1 1 2 3 4)
genstr $need 0 1

Here is an example of running it 10 times:
Code:
100
00
0001
000
10
1100
1
1010
111
10

 

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LEARN ABOUT OPENSOLARIS

srand

rand(3UCB)					     SunOS/BSD Compatibility Library Functions						rand(3UCB)

NAME

       rand, srand - simple random number generator

SYNOPSIS

       /usr/ucb/cc [ flag ... ] file ...

       int rand();

       int srand(seed)
       unsigned seed;

DESCRIPTION

       rand()  uses a multiplicative congruential random number generator with period 2^32 to return successive pseudo-random numbers in the range
       from 0 to 2^31 -1.

       srand() can be called at any time to reset the random-number generator to a random starting point. The generator is initially seeded with a
       value of 1.

SEE ALSO

       cc(1B), drand48(3C), rand(3C), random(3C)

NOTES

       Use of these interfaces should be restricted to only applications written on BSD platforms.  Use of these interfaces with any of the system
       libraries or in multi-thread applications is unsupported.

       The spectral properties of rand() leave a great deal to be desired. drand48(3C) and random(3C) provide much better, though more	elaborate,
       random-number generators.

       The low bits of the numbers generated are not very random; use the middle bits. In particular the lowest bit alternates between 0 and 1.

SunOS 5.11							    30 Oct 2007 							rand(3UCB)
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