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one liner script to find prime numbers between 1 to 100

arunendra
New User

Mar 11, 2013, 10:11 PM

Post #1 of 6 (1791 views)

one liner script to find prime numbers between 1 to 100	Can't Post

I am trying to write a script to find prime numbers between 1 to 100. And the concern is , I want to write in very small like as below one liner shell script:-

$ echo (1..100)| factor | y= 2 | echo $y

Rahul6990
Novice

Mar 12, 2013, 2:55 AM

Post #2 of 6 (1786 views)

Re: [arunendra] one liner script to find prime numbers between 1 to 100 [In reply to]	Can't Post

Use Below code:

Code

perl -lne '(1x$_) =~ /^1?$|^(11+?)\1+$/ || print "$_ is prime"'

Source:
http://www.catonmat.net/blog/perl-regex-that-matches-prime-numbers/

Kenosis
User

Mar 12, 2013, 9:45 AM

Post #3 of 6 (1779 views)

Re: [arunendra] one liner script to find prime numbers between 1 to 100 [In reply to]	Can't Post

The following's adapted from perlmonks:

Code

perl -e '$o=1;{grep!($o%$_),2..$o++or print"$o\n";redo if$o<100}'

Kenosis
User

Mar 12, 2013, 9:54 AM

Post #4 of 6 (1778 views)

Re: [Rahul6990] one liner script to find prime numbers between 1 to 100 [In reply to]	Can't Post

Modify if just a little for it to generate the range of primes:

Code

perl -e '$_=1;(1x$_) =~ /^1?$|^(11+?)\1+$/ || print "$_ is prime\n" while $_++<100'

Laurent_R
Veteran / Moderator

Mar 12, 2013, 10:59 AM

Post #5 of 6 (1773 views)

Re: [Kenosis] one liner script to find prime numbers between 1 to 100 [In reply to]	Can't Post

This style would be more Perlish:

Code

perl -e '$_=1;(1x$_) =~ /^1?$|^(11+?)\1+$/ || print "$_ is prime\n" for (1..100)'

Kenosis
User

Mar 12, 2013, 11:23 AM

Post #6 of 6 (1770 views)

Re: [Laurent_R] one liner script to find prime numbers between 1 to 100 [In reply to]	Can't Post

Then you can omit the initial:

Code

$_=1;

And use:

Code

for 1..100

(This post was edited by Kenosis on Mar 12, 2013, 11:25 AM)

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