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Top Forums UNIX for Dummies Questions & Answers If statement with two boolean conditions Post 302838465 by mryuyu1111 on Monday 29th of July 2013 08:23:26 PM
Old 07-29-2013
If statement with two boolean conditions

Code:
#!/bin/bash

if [ true ] && [ ! false ]
then
        echo "True"
else
        echo "False"
fi

Hi everyone, I am new to UNIX, here I have a if statement elevating two boolean conditions. I thought the output should be True because there are [true] + [true] in the statement. But it turns out to be False.

Can anyone explain to me how to properly use the boolean condition here? Thanks a lot!

Last edited by Scott; 07-30-2013 at 03:22 AM.. Reason: Code tags
 

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OCI_FIELD_NAME(3)														 OCI_FIELD_NAME(3)

oci_field_name - Returns the name of a field from the statement

SYNOPSIS
string oci_field_name (resource $statement, mixed $field) DESCRIPTION
Returns the name of the $field. PARAMETERS
o $statement - A valid OCI statement identifier. o $field - Can be the field's index (1-based) or name. RETURN VALUES
Returns the name as a string, or FALSE on errors. EXAMPLES
Example #1 oci_field_name(3) example <?php // Create the table with: // CREATE TABLE mytab (number_col NUMBER, varchar2_col varchar2(1), // clob_col CLOB, date_col DATE); $conn = oci_connect("hr", "hrpwd", "localhost/XE"); if (!$conn) { $m = oci_error(); trigger_error(htmlentities($m['message']), E_USER_ERROR); } $stid = oci_parse($conn, "SELECT * FROM mytab"); oci_execute($stid, OCI_DESCRIBE_ONLY); // Use OCI_DESCRIBE_ONLY if not fetching rows echo "<table border="1"> "; echo "<tr>"; echo "<th>Name</th>"; echo "<th>Type</th>"; echo "<th>Length</th>"; echo "</tr> "; $ncols = oci_num_fields($stid); for ($i = 1; $i <= $ncols; $i++) { $column_name = oci_field_name($stid, $i); $column_type = oci_field_type($stid, $i); echo "<tr>"; echo "<td>$column_name</td>"; echo "<td>$column_type</td>"; echo "</tr> "; } echo "</table> "; // Outputs: // Name Type // NUMBER_COL NUMBER // VARCHAR2_COL VARCHAR2 // CLOB_COL CLOB // DATE_COL DATE oci_free_statement($stid); oci_close($conn); ?> NOTES
Note In PHP versions before 5.0.0 you must use ocicolumnname(3) instead. This name still can be used, it was left as alias of oci_field_name(3) for downwards compatability. This, however, is deprecated and not recommended. SEE ALSO
oci_num_fields(3), oci_field_type(3), oci_field_size(3). PHP Documentation Group OCI_FIELD_NAME(3)
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