03-22-2013
Yes, I think the sort syntax reinforces what I was trying to say. "sort -t, -k 8 fields.txt" sorts "field 8". The sort man page refers to "field separator" and "field number" and --field-separator. "column" is not even mentioned on the sort man page.
For the position within a field, both sort and cut use "character" instead of "column". In other words, cut says --characters where I would have said --columns. To me "characters" is confusing, as could be interpreted to be "--characters=ABC" as if looking for those "characters". The man pages says "select only these characters". Why did they choose --characters instead of --columns for the option name?
Of course, nobody is going to change the option name at this point. I suppose they could at least improve the cut man page, to say "select only these character positions".
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LEARN ABOUT PHP
fbsql_fetch_field
FBSQL_FETCH_FIELD(3) 1 FBSQL_FETCH_FIELD(3)
fbsql_fetch_field - Get column information from a result and return as an object
SYNOPSIS
object fbsql_fetch_field (resource $result, [int $field_offset])
DESCRIPTION
Used in order to obtain information about fields in a certain query result.
PARAMETERS
o $
result -A result identifier returned by fbsql_query(3) or fbsql_db_query(3).
o $field_offset
- The numerical offset of the field. The field index starts at 0. If not specified, the next field that wasn't yet retrieved by
fbsql_fetch_field(3) is retrieved.
RETURN VALUES
Returns an object containing field information, or FALSE on errors.
The properties of the object are:
o name - column name
o table - name of the table the column belongs to
o max_length - maximum length of the column
o not_null - 1 if the column cannot be
NULL
o type - the type of the column
EXAMPLES
Example #1
fbsql_fetch_field(3) example
<?php
fbsql_connect($host, $user, $password)
or die("Could not connect");
$result = fbsql_db_query("database", "select * from table")
or die("Query failed");
# get column metadata
$i = 0;
while ($i < fbsql_num_fields($result)) {
echo "Information for column $i:<br />
";
$meta = fbsql_fetch_field($result);
if (!$meta) {
echo "No information available<br />
";
}
echo "<pre>
max_length: $meta->max_length
name: $meta->name
not_null: $meta->not_null
table: $meta->table
type: $meta->type
</pre>";
$i++;
}
fbsql_free_result($result);
?>
SEE ALSO
fbsql_field_seek(3).
PHP Documentation Group FBSQL_FETCH_FIELD(3)