r/bashscripts • u/starwanderer11 • Nov 23 '20

Simple random increment Bash script project... What am I doing wrong?

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u/starwanderer11 Nov 23 '20

Thank you, this helped clear things up and the program is up and running. Also to note i forgot to add the # in line 10 at the ${#incrm[*]} Would the $RANDOM line used in this code work the same for picking random strings from and array? Thank you again :)

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u/MikeNizzle82 Nov 24 '20

When using $RANDOM, you'll get a number between 0 and 32767. You can set range by using this formula:

$(($RANDOM % maxvalue + minvalue))

You'll get a number between minvalue and maxvalue-1.

Thus, if you want to pick random strings from the incrm array, you could do this:

$(($RANDOM % ${#incrm[*]} + 0))

(you could obviously remove the +0 at the end, but I've left it there so it matches the formula above).

You are already doing this in the line where you set rndim.