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Top Forums Shell Programming and Scripting Update a field using awk and keep the formatting. Post 302910527 by Don Cragun on Friday 25th of July 2014 05:39:29 AM
Old 07-25-2014
Anytime you reset a numbered field (such as $2=x or sub(regex, replacement, $n)) for n not equal to 0), $0 is recalculated. For the general case, you could try something like:
Code:
(	printf "  2 4 6\n"
	printf "1\t3\t7\t\n"
	printf "\t xyz\t 2\t 3 with more fields\n"
) | awk '
{	n = split($0, delims, /[^[:space:]]*/)
	$2+=3
	$3-=1
	for(i = 1; i <= n; i++)
		printf("%s%s", delims[i], $i)
	print ""
}'

which produces the output:
Code:
  2 7 5
1	6	6	
	 xyz	 5	 2 with more fields

If you want to try this on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk, /usr/xpg6/bin/awk, or nawk.

The loop printing the modified lines and the following print command can be simplified to a single printf command if you know that there are always three fields.

Last edited by Don Cragun; 07-25-2014 at 06:48 AM.. Reason: Add note explaining why problem occurs...
This User Gave Thanks to Don Cragun For This Post:
 

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MYSQLI_FIELD_TELL(3)							 1						      MYSQLI_FIELD_TELL(3)

mysqli_result::$current_field - Get current field offset of a result pointer

       Object oriented style

SYNOPSIS
int$mysqli_result->current_field () DESCRIPTION
Procedural style int mysqli_field_tell (mysqli_result $result) Returns the position of the field cursor used for the last mysqli_fetch_field(3) call. This value can be used as an argument to mysqli_field_seek(3). PARAMETERS
o $ result -Procedural style only: A result set identifier returned by mysqli_query(3), mysqli_store_result(3) or mysqli_use_result(3). RETURN VALUES
Returns current offset of field cursor. EXAMPLES
Example #1 Object oriented style <?php $mysqli = new mysqli("localhost", "my_user", "my_password", "world"); /* check connection */ if (mysqli_connect_errno()) { printf("Connect failed: %s ", mysqli_connect_error()); exit(); } $query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5"; if ($result = $mysqli->query($query)) { /* Get field information for all columns */ while ($finfo = $result->fetch_field()) { /* get fieldpointer offset */ $currentfield = $result->current_field; printf("Column %d: ", $currentfield); printf("Name: %s ", $finfo->name); printf("Table: %s ", $finfo->table); printf("max. Len: %d ", $finfo->max_length); printf("Flags: %d ", $finfo->flags); printf("Type: %d ", $finfo->type); } $result->close(); } /* close connection */ $mysqli->close(); ?> Example #2 Procedural style <?php $link = mysqli_connect("localhost", "my_user", "my_password", "world"); /* check connection */ if (mysqli_connect_errno()) { printf("Connect failed: %s ", mysqli_connect_error()); exit(); } $query = "SELECT Name, SurfaceArea from Country ORDER BY Code LIMIT 5"; if ($result = mysqli_query($link, $query)) { /* Get field information for all fields */ while ($finfo = mysqli_fetch_field($result)) { /* get fieldpointer offset */ $currentfield = mysqli_field_tell($result); printf("Column %d: ", $currentfield); printf("Name: %s ", $finfo->name); printf("Table: %s ", $finfo->table); printf("max. Len: %d ", $finfo->max_length); printf("Flags: %d ", $finfo->flags); printf("Type: %d ", $finfo->type); } mysqli_free_result($result); } /* close connection */ mysqli_close($link); ?> The above examples will output: Column 1: Name: Name Table: Country max. Len: 11 Flags: 1 Type: 254 Column 2: Name: SurfaceArea Table: Country max. Len: 10 Flags: 32769 Type: 4 SEE ALSO
mysqli_fetch_field(3), mysqli_field_seek(3). PHP Documentation Group MYSQLI_FIELD_TELL(3)
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