straight shell arithmetic handles numbers up to 4294967291. The shell random number generator gives values between 1 - 32767. This is a hack using bc - a calculator
Pretty much anything else will require some kind of non-shell appoach - perl, ruby, C....
Thank you this worked, but it is not guaranteed that the numbers are unique right?
Hello
I have multiple accounts that running application that uses unique port number
I want to generate this port from some sid number that stays constant for every user account , is there any place in the system
that generate number that is unique to the account ?
thanks (0 Replies)
Hi...
I have a sequence of jobs and its predecessors..
Input
Job_Name Predecessor
A NULL
B1 A
B2 A
B3 B1
C B3
C B2
So based on these i have to generate the level Number
What i mean is
Let A be level 1
for B1 to happen it should have done A
so B1 level is A+1 = 1+1 = 2 (12 Replies)
Hi All,
I have a requirement where in I have an input as follows:-
input=1-4,6,8-10,12-15
I need to explode this range into an output file as follows:-
1
2
3
4
6
8
9
10
12
13
14
15
My input may vary like 1,5-9,11-13,15-17....... (3 Replies)
As I add new data to database.txt I want to generate a unqiue User Id. This is my current solution.
echo $RANDOM:$lname:$fname >> database.txt
But I seem to have problems when I try and use $RANDOM for formatting like so:
grep "^4539" database.txt | awk -F":" '{print "User... (4 Replies)
hi guys,
I am writing a c program that generates a two dimensional array to make matrix and a vector of random numbers and perform multiplication. I can't figure out whats wrong with my code. It generates a matrix of random numbers but all the numbers in the vector array is same and so is the... (2 Replies)
Hi,
I want to generate 2000 mac address. Please let me know how to do so.
Perl script or there is some tool availlable wherein i can give the count and it will generate that many mac-address
Thanks,
Kriti (4 Replies)
i want to generate a random number through a script, and even if anyone reads the script, they wont be able to figure out what the random number is. only the person who setup the script would know it.
something like this could work: random
the full thread is here:
... (13 Replies)
I need awk script to generate part number sequencing based on data in multiple columns like below
Input File
---------
Col A|Col B|Col C|
1|a|x|
2|b|y|
|c|z|
| |m|
| |n|
And out put should be like
1ax
1ay
1az
1am
1an
1bx
1by (6 Replies)
Hi,
I want 10000+ unique Audio file of approx 2MB each. How can i generate numerous audio files using shell script. Any tool, command or suggestions are welcome.
If i give one audio seed file then can we create numerous unique files with same seed file?
Any help is highly appreciable.... (11 Replies)
Discussion started by: sushil.kumar
11 Replies
LEARN ABOUT FREEBSD
makedev
MAKEDEV(3) BSD Library Functions Manual MAKEDEV(3)NAME
makedev, major, minor -- device number conversion
SYNOPSIS
#include <sys/types.h>
dev_t
makedev(int major, int minor);
int
major(dev_t dev);
int
minor(dev_t dev);
DESCRIPTION
The makedev() macro allows a unique device number to be generated based on its major and minor number. The major() and minor() macros can be
used to obtain the original numbers from the device number dev.
In previous implementations of FreeBSD all block and character devices were uniquely identified by a pair of major and minor numbers. The
major number referred to a certain device class (e.g. disks, TTYs) while the minor number identified an instance within the device class.
Later versions of FreeBSD automatically generate a unique device number for each character device visible in /dev/. These numbers are not
divided in device classes.
On FreeBSD these macros are only used by utilities that need to exchange numbers with other operating systems that may use different encod-
ings for dev_t, but also applications that present these numbers to the user in a more conventional way.
RETURN VALUES
The major() macro returns a device major number that has a value between 0 and 255. The minor() macro returns a device minor number whose
value can span the complete range of an int.
SEE ALSO mknod(2), devname(3), devfs(5)BSD September 28, 2008 BSD