Get random number on command line on MacOs (like shuf)

Question

I need add random number to filename. On Linux I use command like

filename$(shuf -i 10000000-99999999 -n 1)

But on MacOs with this command I recieve error:

sh: shuf: command not found

Here are another solution on MacOs for make it?

Answer 1

Like this maybe:

dd bs=4 count=1 if=/dev/urandom 2>/dev/null | xxd -p 
7bfe4143

Or with od:

head -c 4 /dev/urandom | od -An -tu4
2465874330

Or with bash's $RANDOM:

echo $RANDOM$RANDOM
820227815

Answer 2

Install coreutils with brew install coreutils

use gshuf

Answer 3

Bash $RANDOM is a pretty good solution. Alternatively, you can use "jot", which comes pre-installed on Mac:

$ jot -r 1 10000000 99999999

if you want to generate more than one number, just change the first parameter

$ jot -r 36 10000000 99999999 // Generates 36 Unique Numbers

Answer 4

There is no need to add supplemental tools via HomeBrew, MacOS comes with Ruby and Python builtin. You can do something like:

/usr/bin/ruby -e 'p rand(1...10000000)'

If you want leading zeros:

/usr/bin/ruby -e 'printf "%07d\n", rand(1...10000000)'

You can append the result to a filename prefix by removing the \n and concatenating. Here's an example:

fname=foo`/usr/bin/ruby -e 'printf "%07d", rand(1...10000000)'`; echo $fname

Answer 5

A simple approach could to use the current unix timestamp:

filename$(date '+%s')