Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Deleting specific columns from a file
Top Forums Shell Programming and Scripting Deleting specific columns from a file Post 98942 by vino on Monday 13th of February 2006 07:33:47 AM
Old 02-13-2006
Quote:
Originally Posted by premar
The code you have mentioned will copy the specified columns of the file to a new file.
Is there any way to delete the specified columns from existing file?
AFAIK, awk cannot do a read and write on the same file. You have to make use of the temporary file and then rename it to the original file.

You can use either perl or sed if you dont want the redirection of output to a different file.

The sed solution might not very portable. Because, not every sed has a -i option. You would need GNU sed for that.

Code:
sed -i -e 's_\(.*\),.*,\(.*\),.*_\1,\2_g' input.txt

 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Deleting specific lines in a file

I have a file which has some lines starting with a particular word. I would like to delete 5 lines before each such line containing that particular word. eg: line1 line2 line3 line4 line5 line6 "particular word"... I would like to delete line2-line6 and all such occurences in that... (4 Replies)
Discussion started by: ramu_1980
4 Replies

2. Shell Programming and Scripting

Deleting columns from CSV file

Hi All, Am working on perl script which should delete columns in existing CSV file. If my file is : AA,BB,CC,DD 00,11,22,33 00,55,66,77 00,99,88,21 AA,BB... are all my headers can come in any order (e.g AA,CC,BB...) and rest are values. I want to delete column CC... Can anybody help... (2 Replies)
Discussion started by: darshakraut
2 Replies

3. Shell Programming and Scripting

Deleting columns by list or file

Dear specialists out there, please help a poor awk newbie: I have a very huge file to process consisting of 300000 columns and 1500 rows. About 20000 columns shall be deleted from that file. So it is clear, that I can't do this by writing down all the columns in an awk command like $1, $x etc.... (5 Replies)
Discussion started by: flxms
5 Replies

4. Shell Programming and Scripting

deleting specific lines in a file

I want to delete all lines from a file (orig_file) that contain the regex values (bad_inv_list) I tried a for each loop with sed but it isn't working for file in `cat bad_inv_list`; do sed '/$file/d' orig_file > pared_down_file.1 mv pared_down_file.1 orig_file done I've added... (2 Replies)
Discussion started by: verge
2 Replies

5. Shell Programming and Scripting

Deleting specific lines in a file

Hello, I have a file like this one: 03-07-2011 sunz02 message1 03-07-2011 sunz02 message2 03-07-2011 sunz02 message3 01-07-2011 sunz02 message1 01-07-2011 sunz02 message2 01-07-2011 sunz02 ... (1 Reply)
Discussion started by: asanchez
1 Replies

6. Shell Programming and Scripting

deleting specific lines in a file

Hello, I have a file like: 26-07-2011 sunz02 message1 26-07-2011 sunz02 message2 26-07-2011 sunz02 message3 15-07-2011 sunz02 message1 15-07-2011 sunz02 message2 15-07-2011 sunz02 message3... (5 Replies)
Discussion started by: asanchez
5 Replies

7. Shell Programming and Scripting

Deleting specific lines in a file

Hello, I have a file filled with dates, such as: 04-08-2011 message 04-08-2011 message 03-08-2011 message 01-08-2011 message 31-07-2011 message 24-07-2011 message 15-07-2011 message 13-12-2008 message 26-11-2007 message And I want to delete those lines whose date is older than 10... (5 Replies)
Discussion started by: asanchez
5 Replies

8. UNIX for Advanced & Expert Users

Help in Deleting columns and Renaming Mutliple columns in a .Csv File

Hi All, i have a .Csv file in the below format startTime, endTime, delta, gName, rName, rNumber, m2239max, m2239min, m2239avg, m100016509avg, m100019240max, metric3min, m100019240avg, propValues 11-Mar-2012 00:00:00, 11-Mar-2012 00:05:00, 300.0, vma3550a, a-1_CPU Index<1>, 200237463, 0.0,... (9 Replies)
Discussion started by: mahi_mayu069
9 Replies

9. Shell Programming and Scripting

Deleting specific columns

Hi group, Can you please tell how to delete specific columns from a file. I know something like awk -F, '{ print $1" "$2" "15 }' input.txt > output.txt will delete all other columns. But this is in a way to copy some particular columns. But is there any other way to select just some... (11 Replies)
Discussion started by: smitra
11 Replies

10. Shell Programming and Scripting

Deleting all the fields(columns) from a .csv file if all rows in that columns are blanks

Hi Friends, I have come across some files where some of the columns don not have data. Key, Data1,Data2,Data3,Data4,Data5 A,5,6,,10,, A,3,4,,3,, B,1,,4,5,, B,2,,3,4,, If we see the above data on Data5 column do not have any row got filled. So remove only that column(Here Data5) and... (4 Replies)
Discussion started by: ks_reddy
4 Replies

LEARN ABOUT DEBIAN

fixnt

fixnt(1)							      Debian								  fixnt(1)

NAME

       fixnt - Filter for the Windows NT postscript printer driver.

SYNOPSIS

       fixnt < BADFILE.ps > GOODFILE.ps

DESCRIPTION

       The  Windows  NT  postscript  driver has a tendency to make broken postscript files, that are incompatible with psutils.  fixnt is a filter
       that fixes these problems, allowing the use of psnup(1).

       The filter takes the broken postscript file on stdin, and outputs a fixed postscript file on stdout.  It has no other form  for	invocation
       and takes no options on the command-line.

OPTIONS

       fixnt  takes no options.

BUGS

       fixnt does not check for NTPSOct94.  For a workaround, use a sed(1) command to replace 'NTPSOct94' with 'NTPSOct95', like so:
	      sed 's/NTPSOct94/NTPSOct95/g'
       This is particularly important for Windows NT 3.5 users.

AUTHOR

       fixnt   was   written   by   Holger   Bauer   <Holger.Bauer@topmail.de>,  Michael  Rath	<rath@itsm.uni-stuttgart.de>,  and  Akim  Demaille
       <demaille@inf.enst.fr>.

REPORTING BUGS

       Report bugs to the Authors, but avoid sending large postscript files.

       Patches are always welcome; send to <bauer@itsm.uni-stuttgart.de>.

SEE ALSO

       psnup(1), sed(1)

a2ps								   February 2003							  fixnt(1)
All times are GMT -4. The time now is 04:16 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy