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Shell Programming and Scripting
All possible combinations problem
Post 302961527 by wisecracker on Monday 30th of November 2015 05:13:50 PM
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Hello All,
i have two files, one of the format
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B 124
C 234
D 345
And the other
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Hi,
I need to generate all combinations upto n-1 level,
if the input file looks like say,
A
B
C
D
.
.
....
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Output
A
AB
AC
AD
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A B:
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Hello Scrutinizer / Group ,
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Hi,
I have an input file like this
a
b
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d
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hello,
I'm reading this thread, in which there is this code :awk '
function comb(v,i) {
for(i in A) {
delete A;
if(length(A))
comb((v?v"+":x)i)
else print v"+"i
A;
}
}
{ A }
END {
comb();
} ' infilebut I can't understand where does v come... (5 Replies)
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LEARN ABOUT OPENSOLARIS
rand
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)