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Top Forums Shell Programming and Scripting if condition not evaluating as expected Post 302442688 by jem8271 on Thursday 5th of August 2010 05:25:49 AM

08-05-2010

Registered User

if condition not evaluating as expected

Hi all,

Thanks in advance for your time.

I have a data file like this:

1 7.465753425
2 8.980821918
1 1.717808219
1 6.550684932
0 5.432876712

I wish to write a bash script to check both columns and output a 1 if col1==1 AND col2<3. Otherwise I want to output a 0. In the above example, the result would be:

0
0
1
0
0

My script:

Code:

inputfile=events
outputfile=surv3yrs

while read line
do

type= echo $line | awk '{print $1}'
time= echo $line | awk '{print $2}'

echo $type
echo $time

if [[ $type -eq 1 && $time -lt 3 ]]; then
	echo 1 >> $outputfile
else 
	echo 0 >> $outputfile
fi

done < $inputfile

The echo $type and echo $time statements are in there to ensure the file is read correctly, which it seems to be. However my results are all 0s:

0
0
0
0
0

So my condition statement is never evaluating to true. Can anyone explain why?

Also if there's a better solution to this problem I'd be glad to here it - output can be in another file (as above) or recoded into another column of the same file, I don't really care.

Many thanks,
Jen

jem8271

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LEARN ABOUT PHP

boolval

BOOLVAL(3)								 1								BOOLVAL(3)

boolval - Get the boolean value of a variable

SYNOPSIS

       boolean boolval (mixed  $var)

DESCRIPTION

	Returns the boolean value of $var.

PARAMETERS

	      o $var
		- The scalar value being converted to a boolean.

RETURN VALUES

	The boolean value of $var.

EXAMPLES

       Example #1

	      boolval(3) examples

	      <?php
	      echo '0:	      '.(boolval(0) ? 'true' : 'false')."
";
	      echo '42:       '.(boolval(42) ? 'true' : 'false')."
";
	      echo '0.0:      '.(boolval(0.0) ? 'true' : 'false')."
";
	      echo '4.2:      '.(boolval(4.2) ? 'true' : 'false')."
";
	      echo '"":       '.(boolval("") ? 'true' : 'false')."
";
	      echo '"string": '.(boolval("string") ? 'true' : 'false')."
";
	      echo '"0":      '.(boolval("0") ? 'true' : 'false')."
";
	      echo '"1":      '.(boolval("1") ? 'true' : 'false')."
";
	      echo '[1, 2]:   '.(boolval([1, 2]) ? 'true' : 'false')."
";
	      echo '[]:       '.(boolval([]) ? 'true' : 'false')."
";
	      echo 'stdClass: '.(boolval(new stdClass) ? 'true' : 'false')."
";
	      ?>

	      The above example will output:

	      0:	false
	      42:	true
	      0.0:	false
	      4.2:	true
	      "":	false
	      "string": true
	      "0":	false
	      "1":	true
	      [1, 2]:	true
	      []:	false
	      stdClass: true

SEE ALSO

       floatval(3), intval(3), strval(3), settype(3), is_bool(3), Type juggling.

PHP Documentation Group 														BOOLVAL(3)

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