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Top Forums Shell Programming and Scripting averaging column values with awk Post 302280215 by johnmillsbro on Monday 26th of January 2009 09:46:13 AM
Old 01-26-2009
Thanks Rubin..I think I left out some info though. Your script works great but not for my data...I think the reason is...

1.) My IDs are not linear (i.e. ID001, ID002..rather random ID005, ID001, ID999)

2.) My IDs are not ID001 rather BC followed by a random 6 digits such ..BC000601, BC015656, etc.

3.) All the data is stored in a file called data.txt
such the format is
BC001061
56.66
51.1
12.1223
68
..n
BC567123
1
15.6
12.111
..n
etc etc

Also I am using cygwin and presumably gnu awk

thanks again. I hope that helps
cheers
John
 

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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. The same random data is also available from getentropy(2). Using the getentropy(2) system call interface will provide resiliency to file descriptor exhaustion, chroot, or sandboxing which can make /dev/random unavailable. Additionally, the arc4random(3) API provides a fast userspace random number generator built on the random data source and is preferred over directly accessing the system's random device. /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. The random device implements the Yarrow pseudo random number generator algorithm and maintains its entropy pool. The kernel automatically seeds the algorithm with additional entropy during normal execution. FILES
/dev/random /dev/urandom HISTORY
A random device appeared in the Linux operating system. Darwin September 6, 2001 Darwin
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