As Don said, your example does not match the specification you gave. Maybe you didn't mean "insert 3 random numbers", but "replace the spaces (at a certain position) by a 3-digit random number"?
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You did not say, what shell you want to use. I give you an example solution in Zsh (which is pretty convenient when it comes to programming):
Say you process your file line by line, and have stored one line in variable
, i.e. line contains somthing like
(i.e. 5 spaces between the numbers), and you want to replace the middle three spaces by a random number. This could be done in Zsh by
Note that there are 4 spaces between the pair of slashes, and exactly one space after the second slash. Hence, the expression substitutes the first four spaces in the line, by a single space followed by a 3-digit random number.
Except, of course, that you'll get a 1-digit random number about 10 times out of a thousand (replacing 4 spaces with 2 characters) and a 2-digit random number about 90 times out of a thousand (replacing 4 spaces with 3 characters).
Is anyone know some scripts to generate random number without repetition using bash; for example generate 10 different random numbers.
Thanks (8 Replies)
Hello All,
I want to make a simple script which generate random number from 0 to 1000.
and simply display it.
Plz HELP!!!!!!
Regards,
Waqas Ahmed (2 Replies)
Hi Guys I have a script to find Ranomd numbers. But I want to make the file to produce more random. Could u guys help me plz.
In this Script I have the code that generates random in for loop and the range I have specified in my %chromlength
input and out put will be like this
chrno start end... (3 Replies)
Hi,
I am having trouble with generating random numbers. can this be done with awk?
So I have a file that looks like this:
23 30
24 40
26 34
So column1 is start and column2 is end. I want to generate 3 random #'s between start and stop:
So the output will look like this:
... (9 Replies)
Hi Can someone help me with this one?
I have string..
(PROC_PROC_ID == 12183) <--PID is dynamic
and i want to replace the PID number with whatever PID from
/opt/hpws/apache32_2/logs/httpd.pid file.
i'm having problem since the PID on the string is dynamic. It may be 2-5 digits or more.
... (5 Replies)
Can I insert rows based on line numbers. Say If I need to insert 1 or more rows in a file from line number 10. Can I do that in UNIX
I have a file something like
A
B
C
D
E
F
After row C, I wanted to add 2 records as X and Y. I have the line number after C as my reference. Can I... (2 Replies)
Hi All,
I have one file name called test.txt and its having numbers inside the file.I need to identified next available number with use of unix shell scipt and have to update next available number with use of unix shell script.
Example:-
cat test.txt
5001
5002
5003
5005
7000
7001
... (5 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
Write a shell script that will take the sum of two random number?
Ex: Random n1 +Random n2 = result
i tries to write it but i had some dufficulties
... (3 Replies)
Discussion started by: renegade755
3 Replies
LEARN ABOUT HPUX
rand
rand(3C)rand(3C)NAME
rand(), rand_r(), srand() - simple random-number generator
SYNOPSIS DESCRIPTION
uses a multiplicative, congruential, random-number generator with period 2^32 that returns successive pseudo-random numbers in the range
from 0 to 2^15-1.
can be called at any time to reset the random-number generator to a random starting point. The generator is initially seeded with a value
of 1.
returns a random number at the address pointed to by the randval parameter. The seed parameter can be set at any time to start the random-
number generator at an arbitrary point.
Note
The spectral properties of leave a great deal to be desired. provides a much better, though more elaborate, random-number generator (see
drand48(3C)).
RETURN VALUE
If seed or randval is NULL, returns 0. Otherwise, returns a psuedo-random integer.
EXAMPLES
The following:
int x, y;
srand(10);
x = rand();
y = rand();
would produce the same results as:
int x, y, s = 10;
x=rand_r(&s);
y=rand_r(&s);
WARNINGS
Users of should note that rand_r() now conforms with POSIX.1c. The old prototype of is supported for compatibility with existing DCE
applications only.
SEE ALSO drand48(3C), random(3M), thread_safety(5), random(7).
STANDARDS CONFORMANCE rand(3C)