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Shell Programming and Scripting

Even numbers from text file

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# 15  
Old 01-11-2010
MySQL
hello ,
Code:
perl -wlne 'print if !($_ % 2)' infile

or
Code:
 perl -we 'print grep {$_ % 2 == 0} <>' infile

Regards.
Gaurav.
# 16  
Old 01-11-2010
Quote:
Originally Posted by gaurav1086
hello ,
Code:
perl -wlne 'print if !($_ % 2)' infile

or
Code:
 perl -we 'print grep {$_ % 2 == 0} <>' infile

Regards.
Gaurav.
will this test fail if you have alphanumaric field? ...in my test it will not.
# 17  
Old 01-11-2010
Tools
Quote:
Originally Posted by ahmad.diab
will this test fail if you have alphanumaric field? ...in my test it will not.
The file is supposed to have only numeric values. Again if it doesnt comply then
Image
Code:
perl -wlne 'print if ((/[0-9]+/)&&!($_ % 2))' infile

or
Code:
perl -we 'print grep {/[0-9]+/ && $_ % 2 ==0 } <>' even

Piece of Cake. Smilie

Regards.
# 18  
Old 01-12-2010
gaurav1086:- your perl codes will fail if the input is as below...in my test it will not. Smilie


Code:
shell 6 3 32 programming23  2 5 7 9 6 scripting 4 3 1

# 19  
Old 01-12-2010
Lightbulb
[QUOTE=ahmad.diab;302386264]gaurav1086:- your perl codes will fail if the input is as below...in my test it will not. Smilie


Hello ahmad.diab
Modified Image
Code:
perl -awlne 'foreach (@F) {print if ((/[0-9]+/)&&!($_ % 2))}' infile

OR
Code:
 perl -nlwe 'print grep {/[0-9]+/ && $_ % 2 ==0 } split(/\s+/,$_)' infile

Output
Code:
gaurav@localhost:~$ cat even
2 4 1 6 5
3 6 2 8 3
gaurav@localhost:~$ perl -nlwe 'print grep {/[0-9]+/ && $_ % 2 ==0 } split(/\s+/,$_)' even
246
628
gaurav@localhost:~$

Another ->
Code:
gaurav@localhost:~$ perl -awne 'foreach (@F) {print if ((/[0-9]+/)&&!($_ % 2));}END{print "\n";}' even
246628
gaurav@localhost:~$

Regards.
Gaurav

Regards.
# 20  
Old 01-12-2010
still have a problem in filed number 5:-


Code:
cat infile:-

shell 6 3 32 programming23  2 5 7 9 6 scripting 4 3 1

Code:
o/p
Argument "programming23" isn't numeric in modulus (%) at -e line 1, <> line 1.
632programming23264

# 21  
Old 01-12-2010
Quote:
Originally Posted by ahmad.diab
still have a problem in filed number 5:-


Code:
cat infile:-

shell 6 3 32 programming23  2 5 7 9 6 scripting 4 3 1

Code:
o/p
Argument "programming23" isn't numeric in modulus (%) at -e line 1, <> line 1.
632programming23264

hello ,

Code:
gaurav@localhost:~$ cat even
2 4 1 6 5
3 6 2 8 3
shell 6 3 32 programming23 2 5 8 9 6 scripting 4 3 1
gaurav@localhost:~$ perl -awne 'foreach (@F) {print if ((/^[0-9]+$/)&&!($_ % 2));}END{print "\n";}' even
2466286322864
gaurav@localhost:~$

OR
Code:
gaurav@localhost:~$ perl -nlwe 'print grep {/^[0-9]+$/ && $_ % 2 ==0 } split(/\s+/,$_)' even
246
628
6322864
gaurav@localhost:~$

Modified the regex from /[0-9]+/ to /^[0-9]+$/ . Piece of Cake.
Regards,
Gaurav.

P.S. any more to come. lol Smilie
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