Generating MAC Addresses

printf "%s:%s:%s:%s:%s:%s\n" `jot -r -w "%02x" 6 0 99`

Print Sequences of Numbers

Input:

jot - 1000 10000 1000

Output:

1000
2000
3000
4000
5000
6000
7000
8000
9000
10000

Generate Unique Equal-Length Random Numbers

To generate 1000 unique random numbers, issue:

jot -r 1000 0 65535 | uniq | xargs printf "%05d\n"

where the jot parameters mean:

  • -r means generate random numbers,
  • 1000 for 1000 random numbers,
  • 0 the starting numbers,
  • 65535 the ending random number

The uniq command eliminates any duplicate random numbers. After that the barges command is used to pass the numbers to printf as parameter. The printf command then takes %05d\n as the formatting parameter meaning to print a 5-digit number all the time (for example, if jot generates the number 1, then printf makes sure to pre-pend zeros to obtain 0001.


fuss/jot.txt ยท Last modified: 2017/02/22 18:30 (external edit)

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