Shell Programming and Scripting

Hi All,

I have extracted some report from database for few activities done.

Now I have a requirement to add some random time(In range of 10-35) in front of each activity.

Can be generated random numbers in any bash/sh shell within a given number range, let's say in between 10-30.

Could you please help me.

Have a look at

Code:

 $RANDOM

Manipulate it a bit to get numbers b/w 10 and 30

Panyam, thanks for revert, but how do I manipulate it ? any suggestion ?

Code:

 
echo "10+$RANDOM%10*(2)+2 " | bc 
 
will generate random numbers in 12~30 range, if that suffice.

Thanks Panyam for your useful & quick help, this is what I wanted to do. :-)

You can use also builtin calculation, tested using ksh and bash

Code:

echo $(( 10+RANDOM%21 ))
# or more generic
min=10
max=30
((diff=max-min+1))
echo $(( min + RANDOM%diff ))

Hi.

Code:

shuf -i 10-30 -n 1

produces, in 3 separate runs:

Code:

26
% shuf -i 10-30 -n 1
15
% shuf -i 10-30 -n 1
25

The shuf utility is part of GNU coreutils, Coreutils - GNU core utilities which you could download, configure, compile, etc., if your system does not have coreutils installed or available via your package manager -- easier for Linux than for one of the Unix systems, Solaris, *BSD, etc.

Many features, see on-line man page is at: shuf(1): make random permutations - Linux man page

Best wishes ... cheers, drl