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Full Discussion: bc giving error: (standard_in) 2: parse error
Top Forums Shell Programming and Scripting bc giving error: (standard_in) 2: parse error Post 302442291 by manishma71 on Wednesday 4th of August 2010 01:35:53 AM
Old 08-04-2010
pravin and agn - looks like what you guys said is not helping

#################### CODE ####################
Code:
#!/bin/sh

a="1.23"
b="2.45"

if [ $a > $b ]; then 
    echo "string compare: greater : $a > $b"
else
    echo "string compare: smaller : $a < $b"    
fi

if [ $a -ge $b ]; then 
    echo "int compare: greater : $a > $b"
else
    echo "int compare: smaller : $a < $b"   
fi

if [ $( echo "$a > $b" | bc ) -eq 1 ]; then 
    echo "using bc: greater : $a > $b"
else
    echo "using bc: smaller : $a < $b"
fi

exit 0

#########################################

and output is

Code:
$ ./test.sh
string compare: greater : 1.23 > 2.45
./test.sh: line 12: [: 1.23: integer expression expected
int compare: smaller : 1.23 < 2.45
using bc: smaller : 1.23 < 2.45

the first greater is wrong and second (-le/-ge) is giving error

---------- Post updated at 11:05 AM ---------- Previous update was at 11:05 AM ----------

i want to know the reason for this error:
Code:
(standard_in) 2: parse error
(standard_in) 1: parse error

shell error will go if "bc" works fine.
Last edited by pludi; 08-04-2010 at 03:57 AM..
 

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LEARN ABOUT PHP

apc_cas

APC_CAS(3)								 1								APC_CAS(3)

apc_cas - Updates an old value with a new value

SYNOPSIS

       bool apc_cas (string  $key, int	$old, int  $new)

DESCRIPTION

       apc_cas(3)  updates  an	already existing integer value if the $old parameter matches the currently stored value with the value of the $new
       parameter.

PARAMETERS

	      o $key
		- The key of the value being updated.

	      o $old
		- The old value (the value currently stored).

	      o $new
		- The new value to update to.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      apc_cas(3) example

	      <?php
	      apc_store('foobar', 2);
	      echo '$foobar = 2', PHP_EOL;
	      echo '$foobar == 1 ? 2 : 1 = ', (apc_cas('foobar', 1, 2) ? 'ok' : 'fail'), PHP_EOL;
	      echo '$foobar == 2 ? 1 : 2 = ', (apc_cas('foobar', 2, 1) ? 'ok' : 'fail'), PHP_EOL;

	      echo '$foobar = ', apc_fetch('foobar'), PHP_EOL;

	      echo '$f__bar == 1 ? 2 : 1 = ', (apc_cas('f__bar', 1, 2) ? 'ok' : 'fail'), PHP_EOL;

	      apc_store('perfection', 'xyz');
	      echo '$perfection == 2 ? 1 : 2 = ', (apc_cas('perfection', 2, 1) ? 'ok' : 'epic fail'), PHP_EOL;

	      echo '$foobar = ', apc_fetch('foobar'), PHP_EOL;
	      ?>

	      The above example will output something similar to:

	      $foobar = 2
	      $foobar == 1 ? 2 : 1 = fail
	      $foobar == 2 ? 1 : 2 = ok
	      $foobar = 1
	      $f__bar == 1 ? 2 : 1 = fail
	      $perfection == 2 ? 1 : 2 = epic fail
	      $foobar = 1

SEE ALSO 
apc_dec(3), apc_store(3).
PHP Documentation Group 														APC_CAS(3)
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