Example 1: randomly choose two lines with fixed seed, -r is the reverse flag
$ cat test1.txt | ./rand -n 2 -seed 1006
3
1
$ cat test1.txt | ./rand -n 2 -seed 1006 -r
2
Example 2: when n is larger than the line number of file.
$ cat test1.txt | ./rand -n 4 -seed 1006
3
1
2
$ cat test1.txt | ./rand -n 4 -seed 1006 -r
solve duplicate key in the first column
$ cat test2.txt | solve_dup -n 3 -d .
line1.001 #########
line1.002 *********
line2.001 @@@@@@@@@
line3.001 &&&&&&&&&
line3.002 /////////
line3.003 \\\\\\\\\
$ cat test2.txt | solve_dup -n 7 -d '!!'
line1!!0000001 #########
line1!!0000002 *********
line2!!0000001 @@@@@@@@@
line3!!0000001 &&&&&&&&&
line3!!0000002 /////////
line3!!0000003 \\\\\\\\\
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