PHP exec command is not working with awk command [closed]

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I have following code:

$eff=40;
$pos=34;

$line=exec("tail $i.dssp -n $eff | awk -F" " -v var=$pos '{if ($2==var) print FNR}'");

Please help...

@shuttle87, You will have to look at his previous question to understand the context for this one. — merlin2011
– merlin2011, Commented May 19, 2014 at 1:07
@merlin2011, A link to the previous question would have been an extremely good thing to include in the question because I Was not aware of that context — shuttle87
– shuttle87, Commented May 19, 2014 at 2:03
@shuttle87, I could not agree more. That's why I put in a link in my answer to make it more clear to future readers. — merlin2011
– merlin2011, Commented May 19, 2014 at 2:04

Community · Accepted Answer · 2017-05-23 12:03:53Z

1

As I said in my answer to your previous question, you can fix this easily by using single quotes on the inside.

PHP Code

<?php
$eff=40;
$pos=34;
$i = 'hello';
$line=exec("tail $i.dssp -n $eff | awk -F' ' -v var=$pos '{if ($2==var) print FNR}'");
print "$line\n";
?>

Sample Input (hello.dssp):

foobar 34

Sample Output:

edited May 23, 2017 at 12:03

CommunityBot

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answered May 19, 2014 at 0:56

merlin2011

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