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jot: sequence generator (random numbers, alphanumerical)
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"jot" has one major and one minor advantage over seq.  It can produce
random numbers and stuttered sequences

$ jot -r -b WORD -w FORMAT -s STRING -p PRECISION [n [start [end
[step]]]]

n ..  length of sequence
start, end, step have the usuual meenings (need not be integers)

-r .. random
-p .. the number of digits after the decimal point for generated number 
-s .. separator between values (OFS, output field separator)
-w .. WORD, append WORD to numerical value.  
      if WORD includes format (printf) then value is inserted rather than appended
-b .. WORD, print this fixed word  (not useful)

$ jot -r -p 2 3
39.47
38.00
65.13

$ jot -r -p2 -s, 3
32.48,41.25,64.87

$ jot -r -p2 -s", " -b RAND 3
RAND21.56, RAND7.61, RAND55.52

$ jot -w "number: %d" 3
number: 1
number: 2
number: 3

$ jot -b Hello 3
Hello
Hello
Hello

$ sed 3 | sed 's/.*/Hello/'