Visit Our UNIX and Linux User Community

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:
 
Test Your Knowledge in Computers #647
Difficulty: Medium
Window Maker is a free and open-source window manager for the X Window System designed to emulate NeXTSTEP's GUI.
True or False?

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

CSV formatting with prefixing, appending and padding field

Hi I have a very large csv file with some hundreds of thousands of rows of data. The data is in the following format: Up to four alpha numeric characters for the first word. This is either set as 2 characters followed by 2 spaces, or as a single 4character word. This is then followed by an 8... (7 Replies)
Discussion started by: meself
7 Replies

2. UNIX for Dummies Questions & Answers

Conversion problem with date field and formatting.

Hi, My input file contains the record(s) as below with space as FS. 01-01024180 35000 MV010 02/03/09 0306 03060226 03 02-00410330 470000 MV010 02/03/09 0301 03010276 03 1. I need to convert the field 02/03/09 (dd/mm/yy) to yyyymmdd yet retain the Field separator. Using the modified... (2 Replies)
Discussion started by: talk2pawee
2 Replies

3. Shell Programming and Scripting

How to check field formatting of input file?

Hi, I had input file with below data, abcdefghij;20100903040607;1234567891;GLOBAL; Having values of fields with seperated by semi-colon (;) and ended with line feed (\n). Through shell script, how can I check the field formatting? Thanks in advance. (18 Replies)
Discussion started by: Poonamol
18 Replies

4. Shell Programming and Scripting

awk to update field file based on match

If $1 in file1 matches $2 in file2. Then the value in $2 of file2 is updated to $1"."$2 of file2. The awk seems to only match the two files but not update. Thank you :). awk awk 'NR==FNR{A ; next} $1 in A { $2 = a }1' file1 file2 file1 name version NM_000593 5 NM_001257406... (3 Replies)
Discussion started by: cmccabe
3 Replies

5. Shell Programming and Scripting

awk to update field in file based of match in another

I am trying to use awk to match two files that are tab-delimited. When a match is found between file1 $1 and file2 $4, $4 in file2 is updated using the $2 value in file1. If no match is found then the next line is processed. Thank you :). file1 uc001bwr.3 ADC uc001bws.3 ADC... (4 Replies)
Discussion started by: cmccabe
4 Replies

6. Shell Programming and Scripting

awk to update value in field based on another field

In the tab-delimeted input file below I am trying to use awk to update the value in $2 if TYPE=ins in bold, by adding the value of HRUN= in italics. In the below since in line 1 TYPE=ins the 117282541 value in $2 has 6 added because that is the value of HRUN=. Hopefully the awk is a start but I... (2 Replies)
Discussion started by: cmccabe
2 Replies

7. Shell Programming and Scripting

awk to update field in file2 if not the same as file1

Trying to use awk to: update $2 in file2 with the $2 value in file1, if $1 in file1 matches $13 in file2, which is tab-delimeted. The $2values may already be the same so in that case nothing happens and the next line is processed. There are exactly 4,605 unique $13 values. Thank you :). ... (4 Replies)
Discussion started by: cmccabe
4 Replies

8. Shell Programming and Scripting

awk to update value in field of out file using contents of another Ask

In the out.txt below I am trying to use awk to update the contents of $9.. If $9 contains a + or - then $8 of out.txt is used as a key to lookup in $2 of file. When a match ( there will always be one) is found the $3 value of that file is used to update $9 of out.txt separated by a :. So the... (6 Replies)
Discussion started by: cmccabe
6 Replies

9. Shell Programming and Scripting

awk to update field using matching value in file1 and substring in field in file2

In the awk below I am trying to set/update the value of $14 in file2 in bold, using the matching NM_ in $12 or $9 in file2 with the NM_ in $2 of file1. The lengths of $9 and $12 can be variable but what is consistent is the start pattern will always be NM_ and the end pattern is always ;... (2 Replies)
Discussion started by: cmccabe
2 Replies

10. Shell Programming and Scripting

awk to assign points to variables based on conditions and update specific field

I have been reading old posts and trying to come up with a solution for the below: Use a tab-delimited input file to assign point to variables that are used to update a specific field, Rank. I really couldn't find too much in the way of assigning points to variable, but made an attempt at an awk... (4 Replies)
Discussion started by: cmccabe
4 Replies
SDL_JoystickOpen(3)						 SDL API Reference					       SDL_JoystickOpen(3)

NAME
SDL_JoystickOpen - Opens a joystick for use. SYNOPSIS
#include "SDL.h" SDL_Joystick *SDL_JoystickOpen(int index); DESCRIPTION
Opens a joystick for use within SDL. The index refers to the N'th joystick in the system. A joystick must be opened before it game be used. RETURN VALUE
Returns a SDL_Joystick structure on success. NULL on failure. EXAMPLES
SDL_Joystick *joy; // Check for joystick if(SDL_NumJoysticks()>0){ // Open joystick joy=SDL_JoystickOpen(0); if(joy) { printf("Opened Joystick 0 "); printf("Name: %s ", SDL_JoystickName(0)); printf("Number of Axes: %d ", SDL_JoystickNumAxes(joy)); printf("Number of Buttons: %d ", SDL_JoystickNumButtons(joy)); printf("Number of Balls: %d ", SDL_JoystickNumBalls(joy)); } else printf("Couldn't open Joystick 0 "); // Close if opened if(SDL_JoystickOpened(0)) SDL_JoystickClose(joy); } SEE ALSO
SDL_JoystickClose SDL
Tue 11 Sep 2001, 23:00 SDL_JoystickOpen(3)

Featured Tech Videos

All times are GMT -4. The time now is 08:59 PM.
Unix & Linux Forums Content Copyright 1993-2021. All Rights Reserved.
Privacy Policy