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Perl is installed by default on most modern OS when jot is not.
There are 2 alternatives - vote for the best!
essentially the ruby one, but perhaps has a larger installed base
Get there by going backwards and forgetting the numbers.
This feels more intuitive to me.
Change the number 50 to whatever number of characters you want. Change the character inside the double quotes to whatever you want printed.
If you can do better, submit your command here.
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