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Top Forums Shell Programming and Scripting if statement with two conditions -e, && Post 74925 by vgersh99 on Tuesday 14th of June 2005 11:50:44 AM
Old 06-14-2005
Quote:
Originally Posted by yongho
Question: I just started learning shell scripting a few days ago and I was under the assumption that you didn't need to typeset anything.
you don't.
if you don't,

count=$((count + 1))
becomes
count=$(($count + 1))

Quote:
Originally Posted by yongho
One of my previous counters looked like this (in a while statement, not an if statement:
var1=`expr $var1 + $var2`
..and it worked.
this NOT using ksh/bash builtin capabilities for doing simple integer math.
Quote:
Originally Posted by yongho
But when I tried the expr command in the if statement, it didn't increment at all. Would you know why this is? Could it be because once you enter an if statement, you must use different rules?
nope, that's not it.
are you saying that the 'expr ' increment did not work, but the 'count=$((count+1))' did?
there must be something else different in your 'while' loop.
is your 'while' loopbeing piped with data?
 

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PDOSTATEMENT.BINDVALUE(3)						 1						 PDOSTATEMENT.BINDVALUE(3)

PDOStatement::bindValue - Binds a value to a parameter

SYNOPSIS
public bool PDOStatement::bindValue (mixed $parameter, mixed $value, [int $data_type = PDO::PARAM_STR]) DESCRIPTION
Binds a value to a corresponding named or question mark placeholder in the SQL statement that was used to prepare the statement. PARAMETERS
o $parameter - Parameter identifier. For a prepared statement using named placeholders, this will be a parameter name of the form $:name. For a prepared statement using question mark placeholders, this will be the 1-indexed position of the parameter. o $value - The value to bind to the parameter. o $data_type - Explicit data type for the parameter using the PDO::PARAM_* constants. RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 Execute a prepared statement with named placeholders <?php /* Execute a prepared statement by binding PHP variables */ $calories = 150; $colour = 'red'; $sth = $dbh->prepare('SELECT name, colour, calories FROM fruit WHERE calories < :calories AND colour = :colour'); $sth->bindValue(':calories', $calories, PDO::PARAM_INT); $sth->bindValue(':colour', $colour, PDO::PARAM_STR); $sth->execute(); ?> Example #2 Execute a prepared statement with question mark placeholders <?php /* Execute a prepared statement by binding PHP variables */ $calories = 150; $colour = 'red'; $sth = $dbh->prepare('SELECT name, colour, calories FROM fruit WHERE calories < ? AND colour = ?'); $sth->bindValue(1, $calories, PDO::PARAM_INT); $sth->bindValue(2, $colour, PDO::PARAM_STR); $sth->execute(); ?> SEE ALSO
PDO.prepare(3), PDOStatement.execute(3), PDOStatement.bindParam(3). PHP Documentation Group PDOSTATEMENT.BINDVALUE(3)
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