Bash Return a pseudorandom number
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#!/bin/bash # random2.sh: Returns a pseudorandom number in the range 0 - 1. # Uses the awk rand() function.
AWKSCRIPT=' { srand(); print rand() } ' # Command(s) / parameters passed to awk # Note that srand() reseeds awk's random number generator.
echo -n "Random number between 0 and 1 = "
echo | awk "$AWKSCRIPT" # What happens if you leave out the 'echo'?
exit 0
# Exercises: # ---------
# 1) Using a loop construct, print out 10 different random numbers. # (Hint: you must reseed the "srand()" function with a different seed #+ in each pass through the loop. What happens if you fail to do this?)
# 2) Using an integer multiplier as a scaling factor, generate random numbers #+ in the range between 10 and 100.
# 3) Same as exercise #2, above, but generate random integers this time.
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