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Top Forums Shell Programming and Scripting Format of 'select' generated menu Post 302899159 by Chubler_XL on Sunday 27th of April 2014 09:04:19 PM
Old 04-27-2014
Quote:
Originally Posted by edstevens
Yes, I know I can save and reset it. But my point was that I was not observing the script to actually inherit from the caller.

Code:
oracle:11g$ cat doit2
#!/bin/sh
echo COLUMNS = $COLUMNS
exit

oracle:11g$ echo $COLUMNS
80

oracle:11g$ ./doit2
COLUMNS =

oracle:11g$ echo $COLUMNS
80

oracle:11g$

Perhaps COLUMNS is not exported, try export COLUMNS before running doit2

If COLUMNS is not set scripts/programs could be using tput cols or similar to query the terminal for it's actual width.

Also see bash shopt checkwinsize, this keeps COLUMNS and LINES updated automatically, this is useful for an xterm where the users could resize the window after the shell has started.

Last edited by Chubler_XL; 04-27-2014 at 10:09 PM..
 

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MYSQL_LIST_FIELDS(3)							 1						      MYSQL_LIST_FIELDS(3)

mysql_list_fields - List MySQL table fields

SYNOPSIS
Warning This function was deprecated in PHP 5.4.0, and will be removed in the future, along with the entirety of the original MySQL exten- sion. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include: oSQL Query: SHOW COLUMNS FROM sometable resource mysql_list_fields (string $database_name, string $table_name, [resource $link_identifier = NULL]) DESCRIPTION
Retrieves information about the given table name. This function is deprecated. It is preferable to use mysql_query(3) to issue an SQL SHOW COLUMNS FROM table [LIKE 'name'] statement instead. o $database_name - The name of the database that's being queried. o $table_name - The name of the table that's being queried. o $ link_identifier -The MySQL connection. If the link identifier is not specified, the last link opened by mysql_connect(3) is assumed. If no such link is found, it will try to create one as if mysql_connect(3) was called with no arguments. If no connection is found or established, an E_WARNING level error is generated. A result pointer resource on success, or FALSE on failure. The returned result can be used with mysql_field_flags(3), mysql_field_len(3), mysql_field_name(3) and mysql_field_type(3). Example #1 Alternate to deprecated mysql_list_fields(3) <?php $result = mysql_query("SHOW COLUMNS FROM sometable"); if (!$result) { echo 'Could not run query: ' . mysql_error(); exit; } if (mysql_num_rows($result) > 0) { while ($row = mysql_fetch_assoc($result)) { print_r($row); } } ?> The above example will output something similar to: Array ( [Field] => id [Type] => int(7) [Null] => [Key] => PRI [Default] => [Extra] => auto_increment ) Array ( [Field] => email [Type] => varchar(100) [Null] => [Key] => [Default] => [Extra] => ) Note For backward compatibility, the following deprecated alias may be used: mysql_listfields(3) mysql_field_flags(3), mysql_info(3). PHP Documentation Group MYSQL_LIST_FIELDS(3)
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